title
PHP Tutorial for Beginners 5 # PHP Variables and Echo Function

description
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detail
{'title': 'PHP Tutorial for Beginners 5 # PHP Variables and Echo Function', 'heatmap': [{'end': 489.408, 'start': 463.67, 'weight': 0.945}, {'end': 699.643, 'start': 684.808, 'weight': 0.851}, {'end': 781.6, 'start': 758.178, 'weight': 0.732}], 'summary': 'This php tutorial for beginners covers topics such as variable declaration, initialization, and operations, emphasizing server configuration, data types, container concept, scope, and echo function usage, with examples of variable initialization and output parameters.', 'chapters': [{'end': 55.021, 'segs': [{'end': 36.393, 'src': 'embed', 'start': 0.885, 'weight': 0, 'content': [{'end': 1.406, 'text': 'hello, guys,', 'start': 0.885, 'duration': 0.521}, {'end': 13.496, 'text': 'welcome to the fifth video tutorial on PHP programming for beginners and in this video we are going to see how to use and declare variables in PHP.', 'start': 1.406, 'duration': 12.09}, {'end': 23.466, 'text': "so till now, in the last video, I've shown you how to write your hello world first program and how to provide comment to your program.", 'start': 13.496, 'duration': 9.97}, {'end': 25.627, 'text': 'right and, by the way,', 'start': 23.466, 'duration': 2.161}, {'end': 36.393, 'text': 'make sure that your Apache server is running using your control panel XM control panel and you are able to see this parent directory.', 'start': 25.627, 'duration': 10.766}], 'summary': 'Tutorial on php programming covers variable declaration and server setup.', 'duration': 35.508, 'max_score': 0.885, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E885.jpg'}], 'start': 0.885, 'title': 'Php variables tutorial', 'summary': 'Covers the declaration and usage of variables in php, emphasizing the importance of apache server configuration and file creation.', 'chapters': [{'end': 55.021, 'start': 0.885, 'title': 'Php variables tutorial', 'summary': 'Covers the declaration and usage of variables in php, emphasizing the importance of apache server configuration and file creation.', 'duration': 54.136, 'highlights': ['The tutorial focuses on the declaration and usage of variables in PHP and highlights the significance of ensuring the running of the Apache server for successful execution.', 'The instructor provides guidance on creating a new file for the PHP program, emphasizing the practical application of the knowledge imparted in the previous video tutorials.', 'The tutorial gives a brief overview of the previous video tutorials, including the demonstration of writing the first program and adding comments to the program.']}], 'duration': 54.136, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E885.jpg', 'highlights': ['The tutorial focuses on the declaration and usage of variables in PHP and highlights the significance of ensuring the running of the Apache server for successful execution.', 'The instructor provides guidance on creating a new file for the PHP program, emphasizing the practical application of the knowledge imparted in the previous video tutorials.', 'The tutorial gives a brief overview of the previous video tutorials, including the demonstration of writing the first program and adding comments to the program.']}, {'end': 356.192, 'segs': [{'end': 201.628, 'src': 'embed', 'start': 96.001, 'weight': 0, 'content': [{'end': 111.414, 'text': 'okay, so in PHP variable or PHP variables must begin with and sign okay, So if you are used to some other variable declaration,', 'start': 96.001, 'duration': 15.413}, {'end': 124.784, 'text': 'if you have learned C or C++ or Java or any other programming language, you are used to using data type of the variable first and then the name,', 'start': 111.414, 'duration': 13.37}, {'end': 127.205, 'text': 'and then you can assign the value to it.', 'start': 124.784, 'duration': 2.421}, {'end': 135.492, 'text': "But in PHP, all variables start with this end symbol and they don't start with any data type.", 'start': 127.806, 'duration': 7.686}, {'end': 141.776, 'text': 'PHP interprets their value by the initialization.', 'start': 136.132, 'duration': 5.644}, {'end': 149.461, 'text': "they get okay, and So let's see how we can declare a variable.", 'start': 141.776, 'duration': 7.685}, {'end': 151.362, 'text': 'first of all, what is a variable?', 'start': 149.461, 'duration': 1.901}, {'end': 156.817, 'text': 'a variable is a container for some value.', 'start': 151.362, 'duration': 5.455}, {'end': 161.62, 'text': 'okay. so value variable is something that stores your value.', 'start': 156.817, 'duration': 4.803}, {'end': 168.926, 'text': 'okay. so in PHP we just need to define this and and then the name of your variable.', 'start': 161.62, 'duration': 7.306}, {'end': 183.78, 'text': 'so, for example, I can name my variable as value, for example, and I can initialize this value by a number or a string.', 'start': 168.926, 'duration': 14.854}, {'end': 196.105, 'text': 'so I will initialize this value by a number, for example, and by this initialization, your variable knows, or PHP knows, that this variable,', 'start': 183.78, 'duration': 12.325}, {'end': 201.628, 'text': 'which is value, is of type integer right.', 'start': 196.105, 'duration': 5.523}], 'summary': 'In php, variables start with the $ sign and are initialized without declaring a data type, allowing for flexible value interpretation.', 'duration': 105.627, 'max_score': 96.001, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E96001.jpg'}, {'end': 356.192, 'src': 'embed', 'start': 289.217, 'weight': 5, 'content': [{'end': 303.469, 'text': 'so this boo which starts with with capital B is not equal to this boo which we start with with small b, and this is even not equal to this boo.', 'start': 289.217, 'duration': 14.252}, {'end': 306.912, 'text': 'so PHP variables are case sensitive.', 'start': 303.469, 'duration': 3.443}, {'end': 310.593, 'text': 'okay, Now, global and locally scoped variable.', 'start': 306.912, 'duration': 3.681}, {'end': 322.441, 'text': 'Global variable you can use it anywhere in the program and the local variable we can use inside a function or a class that we will see later.', 'start': 311.173, 'duration': 11.268}, {'end': 336.611, 'text': 'okay, and some of the variable names are reserved in PHP, like post, underscore, post in capital letters, underscore, get in capital letters.', 'start': 322.981, 'duration': 13.63}, {'end': 342.195, 'text': 'these are form variables and in a similar way, some server variables are reserved,', 'start': 336.611, 'duration': 5.584}, {'end': 349.86, 'text': 'so you cannot declare a variable which is same as this server right in capital.', 'start': 342.195, 'duration': 7.665}, {'end': 354.829, 'text': 'so some of the variables are reserved in PHP.', 'start': 351.342, 'duration': 3.487}, {'end': 356.192, 'text': 'right now.', 'start': 354.829, 'duration': 1.363}], 'summary': 'Php variables are case sensitive, with reserved names for form and server variables.', 'duration': 66.975, 'max_score': 289.217, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E289217.jpg'}], 'start': 55.021, 'title': 'Php variables', 'summary': 'Introduces php variable declaration and initialization, emphasizing the dollar sign prefix, data type declaration, and variable rules. it also covers the concept of variable as a container and demonstrates specific examples of variable initialization with data types, highlighting case sensitivity, global and local scope, and reserved variable names like post and get.', 'chapters': [{'end': 161.62, 'start': 55.021, 'title': 'Php variable declaration', 'summary': 'Introduces php variable declaration, emphasizing that variables in php must start with a dollar sign and do not require a data type declaration, highlighting the concept of a variable as a container for a value.', 'duration': 106.599, 'highlights': ['Variables in PHP must begin with a dollar sign and do not require a data type declaration, contrasting with languages like C, C++, and Java.', 'PHP interprets variable values by their initialization, emphasizing the concept of a variable as a container for a value.', 'A variable in PHP is described as a container for a value, reinforcing the fundamental concept of a variable.']}, {'end': 248.135, 'start': 161.62, 'title': 'Php variable initialization', 'summary': "Covers php variable initialization, demonstrating the process of defining and initializing variables, such as 'value' and 'name', with specific data types, like integers and strings, allowing php to determine the variable types.", 'duration': 86.515, 'highlights': ["PHP variables can be defined and initialized using the syntax 'variable_name = value', where the value can be a number or a string.", 'Initializing a variable with a number informs PHP that the variable is of type integer, while initializing it with a string informs PHP that the variable is of type string.']}, {'end': 356.192, 'start': 248.135, 'title': 'Php variable rules and reserved names', 'summary': 'Explains php variable rules, highlighting that php variables are case sensitive, global and locally scoped, and some variable names are reserved, such as post and get, preventing their use as variable names.', 'duration': 108.057, 'highlights': ['PHP variables are case sensitive, as demonstrated by the example of variables with different capitalizations not being equal.', 'Global variables can be used anywhere in the program, while local variables are limited to use inside a function or a class.', 'Certain variable names, such as post and get, are reserved in PHP, along with some server variables, preventing their use as variable names.']}], 'duration': 301.171, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E55021.jpg', 'highlights': ['Variables in PHP must begin with a dollar sign and do not require a data type declaration, contrasting with languages like C, C++, and Java.', 'PHP interprets variable values by their initialization, emphasizing the concept of a variable as a container for a value.', 'A variable in PHP is described as a container for a value, reinforcing the fundamental concept of a variable.', "PHP variables can be defined and initialized using the syntax 'variable_name = value', where the value can be a number or a string.", 'Initializing a variable with a number informs PHP that the variable is of type integer, while initializing it with a string informs PHP that the variable is of type string.', 'PHP variables are case sensitive, as demonstrated by the example of variables with different capitalizations not being equal.', 'Global variables can be used anywhere in the program, while local variables are limited to use inside a function or a class.', 'Certain variable names, such as post and get, are reserved in PHP, along with some server variables, preventing their use as variable names.']}, {'end': 938.109, 'segs': [{'end': 392.924, 'src': 'embed', 'start': 359.137, 'weight': 0, 'content': [{'end': 366.021, 'text': "move further, let's see the uses of this variable.", 'start': 359.137, 'duration': 6.884}, {'end': 376.188, 'text': "so I have already shown you whatever you provide the value of variable, it's called that variable.", 'start': 366.021, 'duration': 10.167}, {'end': 390.241, 'text': 'so if you initialize a variable with a numerical value, it will be called a numerical variable, and if you initialize your variable by a string value,', 'start': 376.188, 'duration': 14.053}, {'end': 392.924, 'text': 'it will be called string variable.', 'start': 390.241, 'duration': 2.683}], 'summary': 'Explains the uses of variables, distinguishing between numerical and string variables.', 'duration': 33.787, 'max_score': 359.137, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E359137.jpg'}, {'end': 489.408, 'src': 'heatmap', 'start': 463.67, 'weight': 0.945, 'content': [{'end': 470.254, 'text': 'i will save it and I will just refresh this.', 'start': 463.67, 'duration': 6.584}, {'end': 474.637, 'text': 'and right now there is nothing printed and no error is coming.', 'start': 470.254, 'duration': 4.383}, {'end': 477.159, 'text': "that's that means our variable.", 'start': 474.637, 'duration': 2.522}, {'end': 481.022, 'text': 'is I mean not giving any error right?', 'start': 477.159, 'duration': 3.863}, {'end': 484.084, 'text': 'no result, because we are not printing anything right now.', 'start': 481.022, 'duration': 3.062}, {'end': 486.366, 'text': "that's why we are not seeing any result.", 'start': 484.084, 'duration': 2.282}, {'end': 489.408, 'text': "but it's not giving any error right.", 'start': 486.366, 'duration': 3.042}], 'summary': 'No output or errors observed while refreshing the variable.', 'duration': 25.738, 'max_score': 463.67, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E463670.jpg'}, {'end': 601.642, 'src': 'embed', 'start': 489.408, 'weight': 1, 'content': [{'end': 502.419, 'text': 'but on the same, on the other hand, for example, I want to multiply this name variable, which is a string variable, by the initialization.', 'start': 489.408, 'duration': 13.011}, {'end': 513.649, 'text': 'so I can do something like this and I want to multiply by this name, by 8, for example.', 'start': 502.419, 'duration': 11.23}, {'end': 523.938, 'text': 'This will not be valid because your variable is a string and you cannot multiply it by some number.', 'start': 516.313, 'duration': 7.625}, {'end': 528.9, 'text': 'So, whenever I try to run this, it will show me error.', 'start': 524.097, 'duration': 4.803}, {'end': 530.861, 'text': 'Use of undefined name.', 'start': 529.38, 'duration': 1.481}, {'end': 532.422, 'text': 'Assume name in this.', 'start': 531.021, 'duration': 1.401}, {'end': 542.266, 'text': 'Okay So, in this way, it will show or throw an error whenever you perform some invalid operations.', 'start': 532.942, 'duration': 9.324}, {'end': 549.917, 'text': 'Right So, you can only do arithmetic operation on numerical values.', 'start': 543.067, 'duration': 6.85}, {'end': 553.259, 'text': 'Okay So, this is this one.', 'start': 550.718, 'duration': 2.541}, {'end': 555.38, 'text': 'It will show an invalid expression.', 'start': 553.339, 'duration': 2.041}, {'end': 562.303, 'text': 'Right Now, I have already shown you in the last video what echo does.', 'start': 555.94, 'duration': 6.363}, {'end': 570.627, 'text': 'Echo is a command or a function you can use to output the parameter passed to it.', 'start': 562.583, 'duration': 8.044}, {'end': 579.99, 'text': 'Okay, so the typical uses of for this is to send data to the client browser.', 'start': 571.388, 'duration': 8.602}, {'end': 585.632, 'text': 'okay, so we have seen this example, but we will see this in detail also,', 'start': 579.99, 'duration': 5.642}, {'end': 601.642, 'text': 'and its syntax is like this void echo and it takes the string argument right and By default, the functions in PHP takes argument in parenthesis.', 'start': 585.632, 'duration': 16.01}], 'summary': 'Invalid operation on string variable shows error. only arithmetic operations on numerical values valid. echo outputs parameter passed to it.', 'duration': 112.234, 'max_score': 489.408, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E489408.jpg'}, {'end': 714.518, 'src': 'heatmap', 'start': 684.808, 'weight': 0.851, 'content': [{'end': 691.74, 'text': 'also, okay, when I run the program, it will give the result, hopefully like this.', 'start': 684.808, 'duration': 6.932}, {'end': 699.643, 'text': 'you see programming knowledge, and the value is 200, because we have multiplied our value by 8.', 'start': 691.74, 'duration': 7.903}, {'end': 705.125, 'text': 'so 25 x 8 is 200 and 200 will be printed here.', 'start': 699.643, 'duration': 5.482}, {'end': 714.518, 'text': "okay, and in the case of variable, if you want to print only the variable, you don't need to use these double quotes.", 'start': 705.125, 'duration': 9.393}], 'summary': 'Program result: value is 200 after multiplying by 8.', 'duration': 29.71, 'max_score': 684.808, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E684808.jpg'}, {'end': 785.583, 'src': 'heatmap', 'start': 758.178, 'weight': 0.732, 'content': [{'end': 764.385, 'text': 'so you can just write comma and the value and it will give you the result.', 'start': 758.178, 'duration': 6.207}, {'end': 771.053, 'text': 'okay, I will just comment these out so that only the value of this will be printed.', 'start': 764.385, 'duration': 6.668}, {'end': 781.6, 'text': 'so I will save it and once I run this, I see this result 25 into 8 is equal to 200.', 'start': 771.953, 'duration': 9.647}, {'end': 785.583, 'text': 'so this is the value and this is the string we have printed.', 'start': 781.6, 'duration': 3.983}], 'summary': 'A code is written to multiply 25 by 8, resulting in the value 200 being printed as a string.', 'duration': 27.405, 'max_score': 758.178, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E758178.jpg'}, {'end': 866.886, 'src': 'embed', 'start': 834.812, 'weight': 4, 'content': [{'end': 847.761, 'text': 'or you can use it like this but, for example, if you want to echo in something, in something using single quotes, for example,', 'start': 834.812, 'duration': 12.949}, {'end': 852.585, 'text': 'i will echo the same value using single quotes.', 'start': 847.761, 'duration': 4.824}, {'end': 857.349, 'text': 'single quotation is just like this, not the double quotation.', 'start': 852.585, 'duration': 4.764}, {'end': 859.091, 'text': "i'll remove these double quotations.", 'start': 857.349, 'duration': 1.742}, {'end': 862.202, 'text': 'then what will happen?', 'start': 860.58, 'duration': 1.622}, {'end': 866.886, 'text': "whatever you include in single quotes, let's see first of all the result.", 'start': 862.202, 'duration': 4.684}], 'summary': 'Demonstrating the use of single quotes for echoing a value, emphasizing the distinction from double quotes.', 'duration': 32.074, 'max_score': 834.812, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E834812.jpg'}, {'end': 923.15, 'src': 'embed', 'start': 900.251, 'weight': 5, 'content': [{'end': 908.698, 'text': 'But on the other hand, when you use double quotes, your value will be rendered from here, whatever is the finalized value of it,', 'start': 900.251, 'duration': 8.447}, {'end': 909.759, 'text': 'and it will be printed.', 'start': 908.698, 'duration': 1.061}, {'end': 915.764, 'text': 'So always use single quote when you want to print something literally as it is.', 'start': 910.62, 'duration': 5.144}, {'end': 923.15, 'text': 'And you can use double quotes whenever you want to print the value of the variable or something like this.', 'start': 916.424, 'duration': 6.726}], 'summary': 'Use single quotes to print literally and double quotes for variable values.', 'duration': 22.899, 'max_score': 900.251, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E900251.jpg'}], 'start': 359.137, 'title': 'Php variables and operations', 'summary': 'Covers variable initialization with numerical and string values, limitations of arithmetic operations on string variables, and demonstrates multiplying a variable with a numerical value. it also explains using the echo function in php to output parameters, including examples of single and double quotes and commas to print values and strings.', 'chapters': [{'end': 489.408, 'start': 359.137, 'title': 'Understanding variable initialization and operations', 'summary': 'Covers the uses of variable initialization with numerical and string values and explains the limitations of performing arithmetic operations on string variables. it also demonstrates the process of multiplying a variable with a numerical value.', 'duration': 130.271, 'highlights': ['The chapter covers the uses of variable initialization with numerical and string values.', 'It explains the limitations of performing arithmetic operations on string variables.', 'Demonstrates the process of multiplying a variable with a numerical value.']}, {'end': 938.109, 'start': 489.408, 'title': 'Php variables and echo', 'summary': 'Explains the limitations of using arithmetic operations on string variables in php and demonstrates the usage of the echo function to output parameters, including examples of using single and double quotes and commas to print values and strings.', 'duration': 448.701, 'highlights': ['Arithmetic operations on string variables in PHP will result in an error, highlighting the limitation of performing invalid operations on non-numerical values.', 'The echo function in PHP is used to output parameters, with typical uses including sending data to the client browser, and it takes a string argument and does not require parentheses when used, with examples of echoing values and strings using double quotes, commas, and single quotes.', 'The chapter also emphasizes the difference between using single quotes and double quotes when using the echo function in PHP, where single quotes will print the literal value and double quotes will render the variable value.', 'The video concludes with a reminder to use single quotes to print literal values and double quotes to print variable values when using variables and the echo function in PHP.']}], 'duration': 578.972, 'thumbnail': 'https://coursnap.oss-ap-southeast-1.aliyuncs.com/video-capture/VGC8St0MH2E/pics/VGC8St0MH2E359137.jpg', 'highlights': ['The chapter covers the uses of variable initialization with numerical and string values.', 'The echo function in PHP is used to output parameters, with typical uses including sending data to the client browser.', 'Demonstrates the process of multiplying a variable with a numerical value.', 'Arithmetic operations on string variables in PHP will result in an error, highlighting the limitation of performing invalid operations on non-numerical values.', 'The chapter also emphasizes the difference between using single quotes and double quotes when using the echo function in PHP.', 'The video concludes with a reminder to use single quotes to print literal values and double quotes to print variable values when using variables and the echo function in PHP.']}], 'highlights': ['The tutorial focuses on the declaration and usage of variables in PHP and highlights the significance of ensuring the running of the Apache server for successful execution.', 'The instructor provides guidance on creating a new file for the PHP program, emphasizing the practical application of the knowledge imparted in the previous video tutorials.', 'The tutorial gives a brief overview of the previous video tutorials, including the demonstration of writing the first program and adding comments to the program.', 'Variables in PHP must begin with a dollar sign and do not require a data type declaration, contrasting with languages like C, C++, and Java.', 'PHP interprets variable values by their initialization, emphasizing the concept of a variable as a container for a value.', 'A variable in PHP is described as a container for a value, reinforcing the fundamental concept of a variable.', "PHP variables can be defined and initialized using the syntax 'variable_name = value', where the value can be a number or a string.", 'Initializing a variable with a number informs PHP that the variable is of type integer, while initializing it with a string informs PHP that the variable is of type string.', 'PHP variables are case sensitive, as demonstrated by the example of variables with different capitalizations not being equal.', 'Global variables can be used anywhere in the program, while local variables are limited to use inside a function or a class.', 'Certain variable names, such as post and get, are reserved in PHP, along with some server variables, preventing their use as variable names.', 'The chapter covers the uses of variable initialization with numerical and string values.', 'The echo function in PHP is used to output parameters, with typical uses including sending data to the client browser.', 'Demonstrates the process of multiplying a variable with a numerical value.', 'Arithmetic operations on string variables in PHP will result in an error, highlighting the limitation of performing invalid operations on non-numerical values.', 'The chapter also emphasizes the difference between using single quotes and double quotes when using the echo function in PHP.', 'The video concludes with a reminder to use single quotes to print literal values and double quotes to print variable values when using variables and the echo function in PHP.']}