note 92214 modified in class.splfixedarray by danbrown

Note, that this is considerably faster and should be used when the size of the array is known. Here are some very basic bench marks: <?php for($size = 1000; $size < 50000000; $size *= 2) { echo PHP_EOL . "Testing size: $size" . PHP_EOL; for($s = microtime(true), $container = Array(), $i = 0; $i < $size; $i++) $container[$i] = NULL; echo "Array(): " . (microtime(true) - $s) . PHP_EOL; for($s = microtime(true), $container = new SplFixedArray($size), $i = 0; $i < $size; $i++) $container[$i] = NULL; echo "SplArray(): " . (microtime(true) - $s) . PHP_EOL; } ?> OUTPUT Testing size: 1000 Array(): 0.00046396255493164 SplArray(): 0.00023293495178223 Testing size: 2000 Array(): 0.00057101249694824 SplArray(): 0.0003058910369873 Testing size: 4000 Array(): 0.0015869140625 SplArray(): 0.00086307525634766 Testing size: 8000 Array(): 0.0024251937866211 SplArray(): 0.00211501121521 Testing size: 16000 Array(): 0.0057680606842041 SplArray(): 0.0041120052337646 Testing size: 32000 Array(): 0.011334896087646 SplArray(): 0.007631778717041 Testing size: 64000 Array(): 0.021990060806274 SplArray(): 0.013560056686401 Testing size: 128000 Array(): 0.053267002105713 SplArray(): 0.030976057052612 Testing size: 256000 Array(): 0.10280108451843 SplArray(): 0.056283950805664 Testing size: 512000 Array(): 0.20657992362976 SplArray(): 0.11510300636292 Testing size: 1024000 Array(): 0.4138810634613 SplArray(): 0.21826505661011 Testing size: 2048000 Array(): 0.85640096664429 SplArray(): 0.46247816085815 Testing size: 4096000 Array(): 1.7242450714111 SplArray(): 0.95304894447327 Testing size: 8192000 Array(): 3.448086977005 SplArray(): 1.96746301651 --was-- Note, that this is considerably faster and should be used when the size of the array is known. Here are some very basic bench marks: <?php for($size = 1000; $size < 50000000; $size *= 2) { echo PHP_EOL . "Testing size: $size" . PHP_EOL; for($s = microtime(true), $container = Array(), $i = 0; $i < $size; $i++) $container[$i] = NULL; echo "Array(): " . (microtime(true) - $s) . PHP_EOL; for($s = microtime(true), $container = new SplFixedArray($size), $i = 0; $i < $size; $i++) $container[$i] = NULL; echo "SplArray(): " . (microtime(true) - $s) . PHP_EOL; } // OUTPUT Testing size: 1000 Array(): 0.00046396255493164 SplArray(): 0.00023293495178223 Testing size: 2000 Array(): 0.00057101249694824 SplArray(): 0.0003058910369873 Testing size: 4000 Array(): 0.0015869140625 SplArray(): 0.00086307525634766 Testing size: 8000 Array(): 0.0024251937866211 SplArray(): 0.00211501121521 Testing size: 16000 Array(): 0.0057680606842041 SplArray(): 0.0041120052337646 Testing size: 32000 Array(): 0.011334896087646 SplArray(): 0.007631778717041 Testing size: 64000 Array(): 0.021990060806274 SplArray(): 0.013560056686401 Testing size: 128000 Array(): 0.053267002105713 SplArray(): 0.030976057052612 Testing size: 256000 Array(): 0.10280108451843 SplArray(): 0.056283950805664 Testing size: 512000 Array(): 0.20657992362976 SplArray(): 0.11510300636292 Testing size: 1024000 Array(): 0.4138810634613 SplArray(): 0.21826505661011 Testing size: 2048000 Array(): 0.85640096664429 SplArray(): 0.46247816085815 Testing size: 4096000 Array(): 1.7242450714111 SplArray(): 0.95304894447327 Testing size: 8192000 Array(): 3.448086977005 SplArray(): 1.96746301651 http://php.net/manual/en/class.splfixedarray.php