php get array key from value code example

Example 1: get key of value array 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;
?>

Example 2: how to get array key in php

<?php
$array = array(
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'fruit3' => 'grape',
    'fruit4' => 'apple',
    'fruit5' => 'apple');

// this cycle echoes all associative array
// key where value equals "apple"
for($i = 0; $i< sizeof($array);$i++){
if (key($array[$i]) == 'apple') {
        echo key($array).'<br />';
    }
    //next($array);
}
?>

Example 3: php get array key

<?php
$array = array(
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'fruit3' => 'grape',
    'fruit4' => 'apple',
    'fruit5' => 'apple');

// this cycle echoes all associative array
// key where value equals "apple"
while ($fruit_name = current($array)) {
    if ($fruit_name == 'apple') {
        echo key($array).'<br />';
    }
    next($array);
}
?>

Example 4: array_search in php

<?php
$a = [
'Canceled' => 1,
'Traded / Filled'=> 2,
'(Not used currently)'=> 3,
'Transit'=> 4,
'Rejected'=> 5,
'Pending'=> 6,
];
echo array_search("5",$a);
?>