The difference of echo, print(), print_r(), sprintf(), var_dump() in PHP 2023
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1: echo: the statement is not a function, there is no return value, and multiple variable values can be output without parentheses. Arrays and objects cannot be output, only simple types (such as int, string) can be printed.
2: print: It is a statement not a function, it has a return value of 1, and only one variable can be output without parentheses. Arrays and objects cannot be output, only simple types (such as int, string) can be printed.
3: print_r: It is a function that can print composite types, such as: stirng, int, float, array, object, etc. When outputting array, it will be represented by a structure, and print_r can be used to make print_r return without output The processed value of print_r
4: printf: It is a function with a return value, the return value is the length of the printed content , and the text is formatted and output (see C language)
5: sprintf: It is a function, similar to printf, but instead of printing, it returns the formatted text (this function writes the formatted string into a variable instead of outputting it), the others are the same as printf.
6: var_dump(): Function, output variable content, type or string content, type, length. Often used for debugging.
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