php get a key from an given value code example

Example 1: array key value php

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
foreach($age as $x=>$x_value)
  {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
  }
?>

Example 2: array_search

// array demo

public $gender = array(
  1 => 'Male',
  2 => 'Female',
  3 => 'Other',
);

$gen = 1;

if ($gen == array_search('Male', $this->gender)) {
  $gender = __d('member', 'male');

} elseif ($gen  == array_search('Female', $this->gender)) {
  $gender = __d('member', 'female');

}