Home php教程 php手册 PHP ereg_replace()函数的工作原理解析

PHP ereg_replace()函数的工作原理解析

Jun 13, 2016 am 11:07 AM
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我们在学习PHP ereg_replace()函数原型:string ereg_replace (string $pattern, string $replacement, string $string)

string eregi_replace (string $pattern, string $replacement, string $string)

PHP ereg_replace()函数c,并将所匹配结果替换为$replacement。当$pattern中包含模式单元(或子模式)时,$replacement中形如“1”或“$1”的位置将依次被这些子模式所匹配的内容替换。而“”或“$0”是指整个的匹配字符串的内容。需要注意的是,在双引号中反斜线作为转义符使用,所以必须使用“\0”,“\1”的形式。

eregi_replace()和PHP ereg_replace()函数的功能一致,只是前者忽略大小写。代码6.6是本函数的应用实例,这段代码演示了如何对程序源代码做简单的清理工作。

PHP ereg_replace()函数代码6.6 源代码的清理

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li>
<span>$</span><span class="attribute">lines</span><span> = </span><span class="attribute-value">file</span><span>('source.php'); //将文件读入数组中  </span>
</li>
<li class="alt">
<span>for($</span><span class="attribute">i</span><span>=</span><span class="attribute-value">0</span><span>; $i</span><span class="tag"><span class="tag-name">count</span><span>($lines); $i++)  </span></span>
</li>
<li><span>{  </span></li>
<li class="alt"><span>//将行末以“\”或“#”开头的注释去掉  </span></li>
<li><span>$lines[$i] = eregi_replace("(//|#).*$", "", $lines[$i]);   </span></li>
<li class="alt"><span>//将行末的空白消除  </span></li>
<li><span>$lines[$i] = eregi_replace("[ nrtvf]*$", "rn", $lines[$i]);   </span></li>
<li class="alt"><span>}  </span></li>
<li><span>//整理后输出到页面  </span></li>
<li class="alt"><span>echo htmlspecialchars(join("",$lines));  </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>
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以上就是PHP ereg_replace()函数的相关用法介绍。


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