How to use var in php

var is a language structure used in PHP to declare and initialize variables. It is used to specify the name and type of the variable. It can also cast variable types via the var_dump() function (PHP 7.4 and above).

Usage of var in PHP

What is var?

var is a language construct in PHP used to declare variables. It tells PHP that you are creating a variable and specifying its type.

Syntax

<code class="php">var <variable_name> = <value>;</code>

Where:

• <variable_name> is the name of the variable
• <value> is the value of the variable

Example

<code class="php">var $age = 30;</code>

This will create a file called $age variable and set its value to 30.

Uses of var

var is used for:

• Declare new variables
• Initialize existing variables
• Coercion (optional, use var_dump())

Coercion

Use # in var ##var_dump() You can force a variable to a specific type. For example:

<code class="php">var_dump((int) "123"); // 输出：int(123)
var_dump((float) "3.14"); // 输出：float(3.14)</code>

Note: Casting is limited to PHP 7.4 and higher. In older versions, it will have no effect.

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