The difference between echo, print_r and var_dump in PHP

This article mainly introduces the analysis of the differences between echo, print_r and var_dump in PHP. It mainly talks about the nature of the types and their operations of the three. The usage differences of data types are of great practical value. Friends in need You can refer to

This article provides a more detailed analysis of the differences between echo, print_r and var_dump in PHP. Share it with everyone for your reference. The specific analysis is as follows:

All three are PHP statements with output functions, but print_r(expression) and var_dump(expression) are functions, and echo is just a language structure, not a function, so it cannot be used as ## Part of #expression.

For the 8 data types that operate php:

①

echo is used to output numerical variables or strings. However, when using echo to output a reference to a variable, such as an array, only the name of the array is output; when a object is output, the server prompts Object of class Person could not be converted to string> error, the error shows that echo can only be used to output strings.

②

The function of print_r(expression) is to output an array. In fact, the type of parameter expression can be numeric variables and reference variables .

③ The output result of the var_dump(expression) function is . The parameter expression represents various variable types. Its function is to

output the detailed information of a variable .

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