[Dolibarr-dev] require_once vs class_exists

[Régis Houssin]

Hi

I did a little test performance between require_once and class_exists.
we gain 50% performance gain using class_exists
see the figures below (tested separately)

class_exists condition will check only if the class is already included.
A require_once will read the file, read file, create the hash, the hash compare to other hashes, and finally decide.

$t1 = microtime(true);
$nbloops = 3000;
$file1 = 'compta/facture/class/facture.class.php';
$file2 = 'societe/class/societe.class.php';
$file3 = 'comm/propal/class/propal.class.php';

for ($i=0;$i<$nbloops;$i++){
    if (! class_exists('Facture'))
        require $file1;
    if (! class_exists('Societe'))
        require $file2;
    if (! class_exists('Propal'))
        require $file3;
}
echo 'script executed in '.(microtime(true)-$t1).' s';
//script executed in 0.0548310279846 s

for ($i=0;$i<$nbloops;$i++){
    require_once $file1;
    require_once $file2;
    require_once $file3;
}
echo 'script executed in '.(microtime(true)-$t1).' s';
//script executed in 0.134128093719 s

Cordialement,
-- 
Régis Houssin
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