如何用正则表达式模式替换文本并在替换文本中集成一个计数器? [英] How to replace text with a regex pattern and integrate a counter in the replacement text?
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问题描述
function parse($string){
$counter = 0;
$string = preg_replace("_\[b\](.*?)\[/b\]_si", '<span class="b">'. $counter .'. $1</span>', $string, -1, $counter);
return $string;
}
我正在尝试制作一个ubb解析器,用于解析标签并将计数放在其前面:
I'm trying to make a ubb parser, that parses tags and put the counting in front of it:
[b]Hey[/b]
[b]Hello[/b]
应返回此:
<span class="b">1. Hey</span>
<span class="b">2. Hello</span>
但是返回此:
<span class="b">1. Hey</span>
<span class="b">1. Hello</span>
所以在上面的函数旁边,我已经尝试过了:
So beside the function above, I've tried this:
function parse($string){
$counter = 0;
$string = preg_replace_callback(("_\[b\](.*?)\[/b\]_si", function(){
'<span class="b">'. $counter++ .'. $1</span>',
}, $string);
}
但是那和顶部的功能不起作用.我在做什么错和/或可以尝试?
but that, and the function at the top, didn't work. What am I doing wrong and/or could I try?
推荐答案
最终在TiMESPLiNTER的帮助下解决了这个问题(感谢他!),不知道未带上 $ 1
并且您必须在回调函数中调用变量 $ matches
并获得 $ matches [1]
而不是$ 1.
Eventually solved it with the help of TiMESPLiNTER (give him the credit!), didn't know $1
didn't get brought along and that you have to call a variable $matches
in the callback function and get $matches[1]
instead of $1.
$counter = 1;
function parse(){
function cb($matches){
global $counter;
return '<span class="b">'. $this->counter .'. ' . $matches[1] . '</span>';
}
$string = preg_replace_callback("_\[b\](.*?)\[/b\]_si", 'cb', $string);
}
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