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Homephp教程PHP源码php ereg_replace函数

<script>ec(2);</script>

$string = "this is a test";
echo str_replace(" is", " was", $string);
echo ereg_replace("( )is", "1was", $string); 其中1就是第一个括号中空格
echo ereg_replace("(( )is)", "2was", $string); 其中2就是第二个括号的空格
上面三行也就是把" is"替换为" was";都有空格的。

ereg_replace ( string pattern, string replacement, string string)
也就是说如果pattern中带有()得字符串(如;括号中有空格),那你的replacement就可以使用如1的字符串,那这个1就给可以用你第1个括号中字符串来替换,如果是2那就用第2个括号中的字符串替换.
括号从左到右,以左括号为准.

下面那个是去掉url中的如&page=1

符串比对解析并取代。

语法: string ereg_replace(string pattern, string replacement, string string);

返回值: 字符串

函数种类: 资料处理


 
 
内容说明


本函数以 pattern 的规则来解析比对字符串 string,欲取而代之的字符串为参数 replacement。返回值为字符串类型,为取代后的字符串结果。


 
 
使用范例


ken@freebsdrocks.com 在 16-mar-1999 提出的例子。

$text = 'this is a {1} day, not {2} and {3}.';
$daytype = array( 1 => 'fine',
                  2 => 'overcast',
                  3 => 'rainy' );
while (ereg ('{([0-9]+)}', $text, $regs)) {
  $found = $regs[1];
  $text = ereg_replace("{".$found."}", $daytype[$found], $text);
}
echo "$textn";
// this is a fine day, not overcast and rainy.
?>

ken@freebsdrocks.com 并同时提出具有相同功能的perl 程序范例如下:

$text = 'this is a {1} day, not {2} and {3}.';
%daytype = ( 1 => 'fine',
             2 => 'overcast',
             3 => 'rainy' );
$text =~ s/{(d+)}/$daytype{$1}/eg;
print "$textn";

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