php - php中二维数组的多重选择

Question

在 PHP 中，我有 2 个数组

$ex1 = array(a,b,c,d,e,f,g,h);
$ex2 = array(c,e,f);

这里如何将其与 PHP 页面中的多个选择选项集成

这里 ex1 是多选数组，例如

<select multiple name=slt[]>

</select>

ex2 值是所选的列表选项

Answer 1

类似于:

<?php

$ex1 = array('a','b','c','d','e','f','g','h');
$ex2 = array('c','e','f');

echo "<select multiple name=slt[]>";

    foreach($ex1 as $val){
        //in_array() checks if value from 1st array ($val) is present
        //anywhere in the second array ($ex2)
        //if yes, that option will be selected. I'm using ternary operator 
        //here instead of if statement
        $selected = (in_array($val,$ex2))?' selected':'';
        echo "<option value='".$val."'$selected>".$val."</option>";
    }

echo "</select>";


?>

<强> PHP Demo

<强> Output Fiddle