PHP查找元素键 [英] PHP find element key

问题描述

我有这个数组

Array
(
  [0] => a
  [1] => b
  [2] => c
  [3] => d
)

如何获取元素的键？（例如a = 0，c = 2）

how can i get an element's key?(for example a=0,c=2)

推荐答案

<?php
$trans = array("a" => 1, "b" => 1, "c" => 2);
$trans = array_flip($trans);
print_r($trans);
?>

http://www.php.net/manual/zh/function.array-flip.php

使用array_search
http://php.net/manual /en/function.array-search.php

Using array_search http://php.net/manual/en/function.array-search.php

<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;
?>

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