php key in array exists
<?php
$search_array = array('first' => null, 'second' => 4);
// returns false
isset($search_array['first']);
// returns true
array_key_exists('first', $search_array);
?>php key in array exists
<?php
$search_array = array('first' => null, 'second' => 4);
// returns false
isset($search_array['first']);
// returns true
array_key_exists('first', $search_array);
?>php find key in array
<?php
$search_array = array('first' => 1, 'second' => 4);
if (array_key_exists('first', $search_array)) {
echo "The 'first' element is in the array";
}
?>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; $ok=true; // or return true;
}
}
if(ok==false){ return -1; } // or return false;
}
//call function
echo find("two");keys of array exist in array
function findKey($array, $keySearch)
{
foreach ($array as $key => $item) {
if ($key == $keySearch) {
echo 'yes, it exists';
return true;
} elseif (is_array($item) && findKey($item, $keySearch)) {
return true;
}
}
return false;
}Copyright © 2021 Codeinu
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