<?php
// 1
$begin=microtime(true);
$key1='keY9'; // searching this
$arr1=array(
'KEY1'=>'value1',
'KEY2'=>'value2',
'KEY3'=>'value3',
'KEY4'=>'value4',
'KEY5'=>'value5',
'KEY6'=>'value6',
'KEY7'=>'value7',
'KEY8'=>'value8',
'KEY9'=>'value9',
'KEY10'=>'value10',
'KEY11'=>'value11',
'KEY12'=>'value12',
'KEY13'=>'value13',
'KEY14'=>'value14',
'KEY15'=>'value15',
);
for($i=0; $i<10000; $i++)
{
$result=array_change_key_case($arr1);
if(isset($result[$key1]))
{
$result=$result[$key1];
assert($result === 'value9');
}
}
$time=microtime(true)-$begin;
echo "\t\tResult: {$time}\n";
// ============
// 2
$begin=microtime(true);
$key2='keY9'; // searching this
$arr2=array(
'KEY1'=>'value1',
'KEY2'=>'value2',
'KEY3'=>'value3',
'KEY4'=>'value4',
'KEY5'=>'value5',
'KEY6'=>'value6',
'KEY7'=>'value7',
'KEY8'=>'value8',
'KEY9'=>'value9',
'KEY10'=>'value10',
'KEY11'=>'value11',
'KEY12'=>'value12',
'KEY13'=>'value13',
'KEY14'=>'value14',
'KEY15'=>'value15',
);
for($i=0; $i<10000; $i++)
{
$keys=array_keys($arr2);
$result=array_search(strtolower($key2),array_map('strtolower',$keys));
if($result!==false)
assert($arr2[$keys[$result]] === 'value9');
}
$time=microtime(true)-$begin;
echo "\t\tResult: {$time}\n";