使用preg_replace删除字符串末尾的多余空间

问题描述

我想用PHP中的preg_replace替换字符串末尾的多余空格.我正在创建一个庞大的单词数据库，不知何故，最后几个单词得到了额外的空白.

I want to replace the extra space at the end of the string with nothing using preg_replace in PHP. I was creating a big database of words and somehow a few words got extra white space at the end.

推荐答案

您应使用 rtrim .它将删除字符串末尾的多余空格，并且比使用preg_replace更快.

$str = "This is a string.    ";
echo rtrim($str);

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速度比较-preg_replace v.trim

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Speed Comparison - preg_replace v. trim

// Our string
$test = 'TestString    ';

// Test preg_replace
$startpreg = microtime(true);
$preg = preg_replace("/^\s+|\s+$/", "", $test);
$endpreg = microtime(true);

// Test trim
$starttrim = microtime(true);
$trim = rtrim($test);
$endtrim = microtime(true);

// Calculate times
$pregtime = $endpreg - $startpreg;
$trimtime = $endtrim - $starttrim;

// Display results
printf("preg_replace: %f<br/>", $pregtime);
printf("rtrim: %f<br/>", $trimtime);

结果

如您所见，rtrim实际上是 九次 更快.

As you can see, rtrim is actually nine times faster.

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