What does & mean in php

The ampersand in PHP has the following uses: Variable reference syntax: Create a variable reference so that changes to the referenced variable are reflected in the referenced variable. Concatenate string syntax: Concatenate two strings and store them in a new variable.

The & symbol in PHP

The & symbol in PHP, also known as the "quote character", has two Main uses:

1. Variable reference

• Syntax: $variable =& $other_variable;
• Function: Create a reference to another variable for the specified variable. This means that any changes to the reference variable will be reflected in the referenced variable.

Example:

$name = "John Doe";
$alias =& $name;

$alias .= " (CEO)";

echo $name; // 输出：John Doe (CEO)

2. Connection string

• Syntax: $string1 .& $string2;
• Function: Concatenate two strings and store the result in a new string variable.

Example:

$firstName = "John";
$lastName = "Doe";

$fullName = $firstName .& $lastName;

echo $fullName; // 输出：John Doe

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