PHP var_dump() function

Author：Eve Cole Update Time：2024-12-28 10:36:01

The var_dump() function is used to output relevant information about variables.

The var_dump() function displays structural information about one or more expressions, including the expression's type and value. Arrays will expand values recursively, showing their structure through indentation.

PHP version requirements: PHP 4, PHP 5, PHP 7

grammar

 void var_dump ( mixed $expression [, mixed $... ] )

Parameter description:

$expression: the variable you want to output.

return value

No return value.

Example

<?php $a = array ( 1 , 2 , array ( " a " , " b " , " c " ) ) ; var_dump ( $a ) ; ?>

The output is:

 array(3) { [0]=> int(1) [1]=> int(2) [2]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }}

Example

<?php $b = 3.1 ; $c = true ; var_dump ( $b , $c ) ; ? >

The output is:

 float(3.1)bool(true)