- array_reduce: documentation ( source)
- print_r: documentation ( source)
- array_filter: documentation ( source)
- array_keys: documentation ( source)
<?php
$test = array('key' => 'value');
print_r(
array_reduce(
array_keys(
array_filter(
$test,
function($key,$value){ return $value == 'value';},
ARRAY_FILTER_USE_BOTH
)
),
function($carry,$value){return $carry . $value;}
)
);