php get value from array by key 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: get specific key value from array php

$ids = array_column($users, 'id');

Example 3: php array extract value

<?php
$array = array("size" => "XL", "color" => "gold");
print_r(array_values($array));
?>

Example 4: get key of array element php

$people = array(
  2 => array(
    'name' => 'John',
    'fav_color' => 'green'
  ),
  5=> array(
    'name' => 'Samuel',
    'fav_color' => 'blue'
  ));
$found_key = array_search('blue', array_column($people, 'fav_color'));

Example 5: array search by key in php

$arr = array(
    "one" => 1,
    "two" => 2,
    "three" => 3,
    "seventeen" => 17
);
function find($mot){
  
  global $arr; // this is global variable
  $ok=false;
 foreach ($arr as $k => $v) 
    {
      if($k==$mot){
        return $v; $ok=true; // or return true;
      }
    }
  if(ok==false){ return -1; }  // or return false;
}

//call function
echo find("two");

Example 6: php take out 2 level array key value

foreach($bigArray as $array){    
    foreach($array as $key=>$value){
        echo $key;
    }
}


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