本文实例讲述了php中正则替换函数ereg_replace用法。分享给大家供大家参考。具体如下：

下面的实例是利用php 正则替换函数 ereg_replace来把指定的字符替换成我想需要的字符实例,代码如下:
复制代码 代码如下:$num = 'www.';
$string = "this string has four words. <br>";
$string = ereg_replace ('four', $num, $string);
echo $string;

$num = '49';
$string = "this string has four words";
$string = ereg_replace ('four', $num, $string);
echo $string;

$string ="测试用文字";
echo "**********$string**********<p>";
$string = ereg_replace ("^", "<br>", $string);
$string = ereg_replace ("$", "<br>", $string);
echo "==========$string==========";

希望本文所述对大家的正则表达式学习有所帮助。