output buffering vs string concatenation / ob vs 拼接字符串

最新推荐文章于 2025-03-09 21:58:56 发布

lein_wang

最新推荐文章于 2025-03-09 21:58:56 发布

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分类专栏： PHP 文章标签： output_buffering

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本文通过实验对比了PHP中字符串拼接与输出缓冲两种方法的性能差异。结果显示，在进行大量字符串操作时，使用输出缓冲的方法比直接字符串拼接效率更高。

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点击打开链接http://stackoverflow.com/questions/6934762/php-performance-difference-between-string-concat-and-buffering-contents

<?php

$test_1_start = microtime();

$str = '';
for ( $x = 0; $x <= 10000; $x++ ) {
    $str .= 'I am string ' . $x . "\n";
}

$test_1_end = microtime();
unset($str);
echo 'String concatenation: ' . ( $test_1_end - $test_1_start ) . ' seconds';

$test_2_start = microtime();

ob_start();
for ( $x = 0; $x <= 10000; $x++ ) {
    echo 'I am string ', $x, "\n";
}
$str = ob_get_contents();
ob_end_clean();

$test_2_end = microtime();

echo "\nOutput buffering: " . ( $test_2_end - $test_2_start ) . ' seconds';

?>

$ php -v
PHP 5.3.4 (cli) (built: Dec 15 2010 12:15:07) 
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
$ php test.php
String concatenation: 0.003932 seconds
Output buffering: 0.002841 seconds%
$ php test.php
String concatenation: 0.004179 seconds
Output buffering: 0.002796 seconds%
$ php test.php
String concatenation: 0.006768 seconds
Output buffering: 0.002849 seconds%
$ php test.php
String concatenation: 0.004925 seconds
Output buffering: 0.002764 seconds%
$ php test.php
String concatenation: 0.004066 seconds
Output buffering: 0.002792 seconds%
$ php test.php
String concatenation: 0.004049 seconds
Output buffering: 0.002837 seconds%