如何根据php数组将预选选项设置为多选标记

Question

I have made a multiple select tag and I would like some of its options to be selected according to given PHP array $attr

<select multiple="multiple" name="isattr[]" id="editAttr">
<?php         
    while($attrresult = mysqli_fetch_array($attrfetch)) {
        echo  "<option>".$attrresult[attr_title]."</option>";
     }
?>
</select>

So if the select tag has the options "Manager" "Programmer" "Teacher" and $attr contains the values "Manager" and "Programmer", these options should be preselected.

Answer 1

Use in_array() to check if the value is in the $attr array, and apply the selected property to the element based on that :

<select multiple = "multiple" name = "isattr[]" id = "editAttr" >
<?php

    $attr = array("Manager", "Programmer");

    while ($attrresult = mysqli_fetch_array($attrfetch)) {

        $selected = in_array( $attrresult[attr_title], $attr ) ? ' selected' : '';

        echo "<option".$selected.">".$attrresult[attr_title]."</option>";

    } 
?> 
< /select>