How to use the var_dump() function in php

In PHP, var_dump() is used to output relevant information about variables, including type, value, etc. The syntax is "var_dump ($expsn)", and the parameter "$expsn" specifies the variable to be output, which can be a A single variable or an expression containing multiple space-separated variables of any type. The var_dump()) function will display structural information about one or more expressions, including the type and value of the expression; if the accepted parameter is an array type, the value will be recursively expanded and its structure will be displayed through indentation.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

PHP var_dump() Function

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

Syntax

var_dump ($expsn)

• $expsn: Specify the variable you want to output. It can be a single variable or an expression containing multiple space-separated variables of any type.

Return value:No return value.

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

Tip As well as outputting the results directly to the browser, you can use the output control function to capture the output of the current function and then (for example) save it to a string.

Example 1:

##Example 2:

Extended knowledge: print_r() and var_dump() are similar

"张三","年龄"=>25,"性别"=>"男"); print_r($arr); ?>

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