<?php
/**
* php array get key by value
* php數組根據值獲取鍵名
* @author http://
*/
$items = array(
"banana" => "fruit",
"tomato" => "vegetable",
"lentil" => "bean",
"apple" => "vegetable"
);
//1.返回一個鍵名，如果值有重復返回第一個鍵名
$key = array_search('vegetable', $items);
echo $key;
//tomato
//2.返回多個鍵名
$keys = array_keys($items, 'vegetable');
print_r($keys);
/*
Array
(
[0] => tomato
[1] => apple
)
*/
?>
*
