The role of break in php

break is a reserved word in some computer programming languages, and its function is to terminate the loop at the current level in most cases. In the switch (switch statement) of C language, the break statement can also be used to jump out of the current switch structure immediately after executing a case (branch). In the process of debugging some programs, break is used to set breakpoints. Next we will introduce the role of break in PHP.

Recommended tutorial: PHP video tutorial

##break ends the current for, foreach, while, do- Execution of while or switch structure.

break can accept an optional numeric parameter to determine how many loops to break out of.

<?php
    $arr = array(&#39;one&#39;, &#39;two&#39;, &#39;three&#39;, &#39;four&#39;, &#39;stop&#39;, &#39;five&#39;);
    while (list (, $val) = each($arr)) {
        if ($val == &#39;stop&#39;) {
            break; /* You could also write &#39;break 1;&#39; here. */
        }
        echo "$val<br />/n";
    }
/* Using the optional argument. */
    $i = 0;
    while (++$i) {
        switch ($i) {
            case 5:
                echo "At 5<br />/n";
                break 1; /* Exit only the switch. */
            case 10:
                echo "At 10; quitting<br />/n";
                break 2; /* Exit the switch and the while. */
            default:
                break;
            }
        }
?>

The above is the detailed content of The role of break in php. For more information, please follow other related articles on the PHP Chinese website!