Search in Array PHP -

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i want make search function in following array:

array(           array("key" => "net_sale",         "value" => "net sale crtn"),     array("key" => "productive_calls", "value" => "productive calls"),     array("key" => "drop_size_value",  "value" => "drop size value"),     array("key" => "sku",              "value" => "sku per bill"),     array("key" => "net_amount",       "value" => "net amount"),     array("key" => "drop_size_crtn",   "value" => "drop size crtn"),     array("key" => "productive_pops",  "value" => "productive pops"),     array("key" => "scheduled_pops",   "value" => "scheduled pops")  );

this function return position key searched. (for example search "net_amount" return 4)

function search($array,$key_value) {    foreach($array $key => $value) {      if($value['key'] == $key_value) return $key;    } } echo search($arr,'net_amount'); //$arr contains array gave example

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