Question

i 采用<代码>preg_match_all,在座标上找到某些标记:

$str = " 
Line 1: This is a string 
Line 2: [img]http://placehold.it/350x150[/img] Should not be [youtube]SDeWJqKx3Y0[/youtube] included."; 

preg_match_all("~[img](.+?)[/img]~i", $str, $img);  
preg_match_all("~[youtube](.+?)[/youtube]~i", $str, $youtube);

foreach ($img[1] as $key => $value) {
    echo  <img src=" .$value. " "/> ;
}

foreach ($youtube[1] as $key => $value) {
    echo  <iframe width="420" height="315" src="http://www.youtube.com/embed/ .$value. " frameborder="0" allowfullscreen> </iframe> ;
}

这将完全恢复正与正确价值观相呼应的东西。

但实际想要的是将整条插法与<代码>[img]和[youline]等标号重新编号,代之以各声明的数值:

Line 1: This is a string 
    Line 2: <img src="http://placehold.it/350x150" "/> Should not be <iframe width="420" height="315" src="http://www.youtube.com/embed/SDeWJqKx3Y0" frameborder="0" allowfullscreen> </iframe> included.

i m not looking for a 3rd party alternative, just plain php functions.

i mink of using preg_match and some case and switch statements, but i don tred

想法?

Answer 1

您可使用preg_replace。

与此类似。

$pattern = Array();
$pattern[0] = "~[img](.+?)[/img]~i";
$pattern[1] = "~[youtube](.+?)[/youtube]~i";

$replacement = Array();
$replacement[0] =  <img src="${1}" "/> ;
$replacement[1] =   <iframe width="420" height="315" src="http://www.youtube.com/embed/${1}" frameborder="0" allowfullscreen> </iframe> ;

$stringToReturn = preg_replace($pattern, $replacement, $str);

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