php 将字符串中的连续多个空格转换为一个空格

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                * 多个连续空格只保留一个<br />*<br />* @param string $string 待转换的字符串<br />* @return string $string 转换后的字符串<br />*/<br />function merge_spaces($string){<br />	return preg_replace("/s(?=s)/","\1",$string);<br />}