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54 lines
1.3 KiB
54 lines
1.3 KiB
<?php
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/**
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* It's hard to believe this isn't a PHP builtin.
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*
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* @param $source array to pull a subset of key/value pairs out of
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* @param $keys list of keys to pull out
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* @return $result array
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*/
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function array_subset_of_the_array_based_on_a_list_of_keys (array $source, array $keys)
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{
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$result = array();
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foreach ($keys as &$key)
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$result[$key] = $source[$key];
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return $result;
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}
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function faster_version (array $source, array $keys)
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{
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$result = array();
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for ($i = 0, $size = count($keys); $i < $size; ++$i) {
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$key = $keys[$i];
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$result[ $key ] = $source[ $key ];
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}
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return $result;
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}
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$keys = array('one', 'two', 'three', 'four', 'five', 'six');
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$source = array(
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'one' => 'blakdlajsfdlkajfds;lasjkflaksjf',
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'two' => 'asdfkljasfkjsadfas;jdfas ldfjk',
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'three' => 'alk;sjdfasklfjaslf;ja',
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'four' => '6',
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'five' => 2,
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'six' => 12314
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);
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$start = microtime(true);
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for ($i = 0, $size = 100000; $i < $size; ++$i) {
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$pulled = faster_version($source, array('one', 'three', 'five'));
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}
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$time1 = microtime(true) - $start;
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$start = microtime(true);
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for ($i = 0, $size = 100000; $i < $size; ++$i) {
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$pulled = array_subset_of_the_array_based_on_a_list_of_keys($source, array('one', 'three', 'five'));
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}
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$time2 = microtime(true) - $start;
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echo "time1: $time1\ntime2: $time2\n";
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