PHP MYSQL
CURRENT MEMORY USAGE (BYTES) echo memory_get_usage(); PEAK MEMORY USAGE (BYTES) echo memory_get_peak_usage();
01
CONNECT TO DATABASE $pdo = new PDO("mysql:host=HOST; dbname=NAME;charset=utf8", USER, PASSWORD);
02
PREPARE SQL $stmt = $pdo->prepare("SELECT * FROM `USERS`"); $stmt->execute();
BAD - FETCH ALL AT ONCE $results = $stmt->fetchAll(); foreach ($results as $r) { print_r($r); }
03
GOOD - FETCH LINE-BY-LINE while ($r = $stmt->fetch()) { print_r($r); }
04
BAD - READ ENTIRE FILE $data = file_get_contents("FILE"); print_r($data);
GOOD - READ LINE BY LINE $fh = fopen("FILE", "r"); while (($line = fgets($fh)) !== false) { echo $line; } fclose($fh);
05
BAD - NEEDLESS VARIABLES $varA = 123; $varB = 234; $varC = $varA + $varB;
GOOD - NO EXTRA VARIABLES $varC = 123 + 234;
06
TEMPORARY VARIABLES $varA = 123; $varB = 234; $varC = $varA + $varB;
REMOVE IF NO LONGER IN USE unset($varA); unset($varB); gc_collect_cycles();