控制流 / 控制流中断

<?php

$numbers = [235711131719];
$str = "";
foreach ($numbers as $number) {
    if ($number > 10)
        break;
    $str .= ($str == "" ? "" : "-") . $number;
}
//str is "2-3-5-7"
echo $str;


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

break accepts an optional numeric argument which tells it how many nested enclosing structures are to be broken out of. The default value is 1, only the immediate enclosing structure is broken out of.