Differences between echo, print_r and var_dump in PHP

This article mainly introduces the differences between echo, print_r, and var_dump in PHP. it mainly describes the nature of the three types and the usage differences of the operational data types, which is of great practical value, for more information about echo, print_r, and var_dump in PHP, see the following section. Share it with you for your reference. The specific analysis is as follows:

All three are php statements with output functions, but print_r (expression), var_dump (expression) is a function, and echo is only a language structure, not a function, so it cannot be part of the expression.

For the eight data types used to operate php:

①Echo is used to output numeric variables or strings. However, when echo is used to output referenced variables, such as arrays, only the names of arrays are output.When an object is output, the server prompts Error. echo can only be used to output strings.

②Print_r (expression) is used to output an array. In fact, the expression type of the parameter can be a numerical variable or a reference variable..

③ Var_dump (expression) function output result <Variable type, variable value, variable length> The expression parameter indicates various variable types. Output the details of a variable..

I hope this article will help you with PHP programming.