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<?php ini_set('display_errors', 1); error_reporting(E_ALL); // Make a big, honkin test array // You may need to adjust this depth to avoid memory limit errors $testArray = fillArray(0, 5); // Time json encoding $start = microtime(true); json_encode($testArray); $jsonTime = microtime(true) - $start; echo "JSON encoded in $jsonTime seconds\n"; // Time serialization $start = microtime(true); serialize($testArray); $serializeTime = microtime(true) - $start; echo "PHP serialized in $serializeTime seconds\n"; // Compare them if ($jsonTime < $serializeTime) { printf("json_encode() was roughly %01.2f%% faster than serialize()\n", ($serializeTime / $jsonTime - 1) * 100); } elseif ($serializeTime < $jsonTime ) { printf("serialize() was roughly %01.2f%% faster than json_encode()\n", ($jsonTime / $serializeTime - 1) * 100); } else { echo "Unpossible!\n"; } function fillArray( $depth, $max ) { static $seed; if (is_null($seed)) { $seed = array('a', 2, 'c', 4, 'e', 6, 'g', 8, 'i', 10); } if ($depth < $max) { $node = array(); foreach ($seed as $key) { $node[$key] = fillArray($depth + 1, $max); } return $node; } return 'empty'; }
Output for git.master
JSON encoded in 0.0036039352416992 seconds PHP serialized in 0.0030598640441895 seconds serialize() was roughly 17.78% faster than json_encode()
Output for git.master_jit
JSON encoded in 0.0036070346832275 seconds PHP serialized in 0.0032460689544678 seconds serialize() was roughly 11.12% faster than json_encode()

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