e_notice_stays_off.php

<?php
define('IT', 100000);

error_reporting(E_ALL);

$g = array('a' => 'b');
$a = '';

function _(&$in, $k=null){
    if (!isset($in)) return null;
    if (is_array($in)){     
        return isset($k) ? ( isset($in[$k]) ? $in[$k] : null) : new WrappedArray($in);  
    } 
    return $in ?: null;
}

class WrappedArray{
    private $v;

    function __construct(&$v){
        $this->v = $v;
    }

    function __get($key){
        return isset($this->v[$key]) ? $this->v[$key] : null;
    }

    function __set($key, $value){
        $this->v[$key] = $value;
    }
}

error_reporting(E_ALL ^ E_NOTICE);
$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a = $g['gnegg'];   
}
$end = microtime(true);
printf("Notices off. Array %d iterations took %.6fs\n", IT, $end-$start);


$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a = isset($g['gnegg']) ? $g['gnegg'] : null;
}
$end = microtime(true);
printf("Notices off. Inline. Array %d iterations took %.6fs\n", IT, $end-$start);


$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a .= $blupp;   
}
$end = microtime(true);
$a = "";
printf("Notices off. Var. Array %d iterations took %.6fs\n", IT, $end-$start);


error_reporting(E_ALL);

$start = microtime(true);
for($i = 0; $i < IT; $i++){
    @$a = $g['gnegg'];    
}
$end = microtime(true);
printf("Notices on. @-operator. %d iterations took %.6fs\n", IT, $end-$start);

$start = microtime(true);
for($i = 0; $i < IT; $i++){
    @$a .= $blupp;    
}
$end = microtime(true);
printf("Notices on. Var. @-operator. %d iterations took %.6fs\n", IT, $end-$start);


$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a = _($g)->gnegg;  
}
$end = microtime(true);
printf("Wrapped array. %d iterations took %.6fs\n", IT, $end-$start);

$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a = _($g, 'gnegg');    
}
$end = microtime(true);
printf("Parameter call. %d iterations took %.6fs\n", IT, $end-$start);


$start = microtime(true);
for($i = 0; $i < IT; $i++){
    $a .= _($blupp);    
}
$end = microtime(true);
$a="";
printf("Undefined var. %d iterations took %.6fs\n", IT, $end-$start);