如何通过在php数组中搜索特定值来获取关键字

function getKey($arr,$value){
  foreach($arr as $key=>$element) {
    if($element["id_img"] == $value)
      return $key;
  }
  return false;
}

纯粹出于个人喜好，我喜欢在没有foreach或for循环的情况下做事。

这是我的选择：

$array_test = array (
    0  => array("id_img" => 18, "desciption" => "Super image", "author" => "Person 1"),
    1  => array("id_img" => 17, "desciption" => "Another image", "author" => "Person 2"),
    2  => array("id_img" => 22, "desciption" => "The last image", "author" => "John Doe"),
);
$result = array_filter( $array_test, function( $value )
{
    return $value['id_img'] == 17 ? true : false;
});
$key = array_keys( $result )[0];
print_r( $key );

我不使用循环，而是使用array_filter()只获取数组中与我的规则匹配的项（如Closure的return语句中所定义的）。由于我知道我只有一个值为17的ID，所以我知道我最终在$result数组中只有一个项。然后，我从数组键中检索第一个元素（使用array_keys( $result )[0]）-这是原始数组中保存id_img=17的键。

<?php
$found=false;
$searched=17;
foreach($array_test as $k=>$data)
 if($data['id_img']==$searched)
   $found=$key;

您的密钥在$foundvar中，如果未找到，则为false

Try:
$array_test = array (
0  => array("id_img" => 18, "desciption" => "Super image", "author" => "Person 1"),
1  => array("id_img" => 17, "desciption" => "Another image", "author" => "Person 2"),
2  => array("id_img" => 22, "desciption" => "The last image", "author" => "John Doe"),
);
$result = null;
foreach($array_test as $key => $val )
{
  if( $val['id_img'] == 17 )
    $result = $key;
}
return $result;