数组中字符串的部分匹配并返回键

Question

如何在数组中搜索部分字符串匹配并返回数组中第一次出现的键。 以下示例

$keys = array(0 => 'Industrial acids', 1 => 'Industrial chemicals', 2 => 'ovens', 3 => 'Chemical companies');

搜索Indus必须返回0

       Industrial must return 0
       chemi must return 1  
       Industrial chemi must return 1   

Answer 1

您可以使用简单的foreach

<?php
$index = 0;
$searchedString='chemic';
foreach($keys as $key => $value){
    if ($value == $searchedString){ //If you are searching the exact String $searchedString (here 'chemics'
        $index = $key;
        break; //To be sure it will be the first index
    }
}
echo $index;
?>

如果您只想知道字符串中是否有“chemic”，请使用strpos($value,$searchedString) !== false代替$value == $searchedString