Detailed explanation of the usage of passing parameters by reference in PHP

This article mainly introduces the usage of PHP passing parameters by reference, and combines specific examples to analyze the functions and operating techniques of using references to pass parameters in PHP function parameters. Friends in need can refer to the following

Read first An example from the manual:

<?php
function add_some_extra(&$string) // 引入变量，使用同一个存储地址
{
  $string .= &#39;and something extra.&#39;;
}
$str = &#39;This is a string, &#39;;
add_some_extra($str);
echo $str;  // outputs &#39;This is a string, and something extra.&#39;
?>

Output:

This is a string, and something extra.

if Without the ampersand,

<?php
function add_some_extra($string)
{
  $string .= &#39;and something extra.&#39;;
}
$str = &#39;This is a string, &#39;;
add_some_extra($str);
echo $str;  // outputs &#39;This is a string, &#39;
?>

output:

This is a string,

The above is the entire content of this article, I hope it will be helpful to everyone’s study.

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