$string = "<tag>i dont know what is here</tag>"
$string = str_replace("???", "<tag></tag>", $string);
echo $string; // <tag></tag>
那么我需要找什么代码?
$string = "<tag>i dont know what is here</tag>"
$string = str_replace("???", "<tag></tag>", $string);
echo $string; // <tag></tag>
那么我需要找什么代码?
一个通用函数:
function replace_between($str, $needle_start, $needle_end, $replacement) {
$pos = strpos($str, $needle_start);
$start = $pos === false ? 0 : $pos + strlen($needle_start);
$pos = strpos($str, $needle_end, $start);
$end = $pos === false ? strlen($str) : $pos;
return substr_replace($str, $replacement, $start, $end - $start);
}
$search = "/[^<tag>](.*)[^<\/tag>]/";
$replace = "your new inner text";
$string = "<tag>i dont know what is here</tag>";
echo preg_replace($search,$replace,$string);
输出:
<tag>your new inner text</tag>
$string = "<tag>I do not know what is here</tag>";
$new_text = 'I know now';
echo preg_replace('#(<tag.*?>).*?(</tag>)#', '$1'.$new_text.'$2' , $string); //<tag>I know now</tag>
$string = "<tag>i dont know what is here</tag>";
$string = preg_replace('|^<([a-z]*).*|', '<$1></$1>', $string)
echo $string; // <tag></tag>
通用非正则表达式解决方案:
我修改了@felix-kling的答案。现在它只会替换文本,如果找到了指定的词。
此外,我添加了参数,以替换指定的词、指定起始位置和替换所有匹配项。
我使用了mb_
函数,使该函数支持多字节字符安全处理。
如果您需要不区分大小写的解决方案,请将mb_strpos
调用替换为mb_stripos
。
function replaceBetween($string, $needleStart, $needleEnd, $replacement,
$replaceNeedles = false, $startPos = 0, $replaceAll = false) {
$posStart = mb_strpos($string, $needleStart, $startPos);
if ($posStart === false) {
return $string;
}
$start = $posStart + ($replaceNeedles ? 0 : mb_strlen($needleStart));
$posEnd = mb_strpos($string, $needleEnd, $start);
if ($posEnd === false) {
return $string;
}
$length = $posEnd - $start + ($replaceNeedles ? mb_strlen($needleEnd) : 0);
$result = substr_replace($string, $replacement, $start, $length);
if ($replaceAll) {
$nextStartPos = $start + mb_strlen($replacement) + mb_strlen($needleEnd);
if ($nextStartPos >= mb_strlen($string)) {
return $result;
}
return replaceBetween($result, $needleStart, $needleEnd, $replacement, $replaceNeedles, $nextStartPos, true);
}
return $result;
}
$string = "{ Some} how it {is} here{";
echo replaceBetween($string, '{', '}', '(hey)', true, 0, true); // (hey) how it (hey) here{
$string = "<tag>i dont know what is here</tag>"
$string = "<tag></tag>";
echo $string; // <tag></tag>
$string = str_replace($string, "<tag></tag>", $string);
抱歉,我忍不住了。也许您可以在问题中添加更多细节。;)
<tag>
标签内部的内容,那么可能存在另一个<tag>
标签,例如:<tag>something<tag>something else</tag></tag>
因此,一个普通的字符串替换函数无法完成这项工作。
更健壮的解决方案是将字符串视为XML,并使用DOMDocument
进行操作。诚然,这仅在字符串有效为XML时才起作用,但我仍然认为它比字符串替换更好。
$string = "<tag>i don't know what is here</tag>";
$replacement = "replacement";
$doc = new DOMDocument();
$doc->loadXML($str1);
$node = $doc->getElementsByTagName('tag')->item(0);
$newNode = $doc->createElement("tag", $replacement);
$node->parentNode->replaceChild($newNode, $node);
echo $str1 = $doc->saveHTML($node); //output: <tag>replacement</tag>
$var = "Nate";
$body = "Hey there {firstName} have you already completed your purchase?";
$newBody = replaceVariable($body,"{","}",$var);
echo $newBody;
function replaceVariable($body,$needleStart,$needleEnd,$replacement){
while(strpos($body,$needleStart){
$start = strpos($body,$needleStart);
$end = strpos($body,$needleEnd);
$body = substr_replace($body,$replacement,$start,$end-$start+1);
}
return $body;
}
我必须替换一个提交到文本区域的变量。因此,我用 Nate 替换了 firstName(包括花括号)。
strpos($body,$needleEnd);
会从字符串的开头开始搜索。如果要从 needle 开始搜索,您需要一个偏移量:strpos($body,$needleEnd, $needleStart);
。 - AlexSp3