我有這樣的文字"Hello, Hello, how are you?Hello, Hello, how are you?<br />Hello,Hello,<br />How are you?How are you today?I am fine; I am greatI am fine;<br />I am just greatI am fine; I am greatI'm very well today!<br />Great!Hello, Hello, how are you?<br />Hello, Hello, how are you?Hello, Hello, How are you?<br />How are you today?"我需要將第四號替換<br />為<img>如果只<br/>找到一個，則替換第一個就一次我嘗試使用function str_replace_first($from, $to, $subject){ $from = '/'.preg_quote($from, '/').'/'; return preg_replace($from, $to, $subject, 1);}但它只替換了找到的第一個我嘗試更換4號
1 回答
千萬里不及你
TA貢獻1784條經驗 獲得超9個贊
嘗試這個 ：
<?php
$txt = "Hello, Hello, how are you?
Hello, Hello, how are you?<br />
Hello,
Hello,<br />
How are you?
How are you today?
I am fine; I am great
I am fine;<br />
I am just great
I am fine; I am great
I'm very well today!<br />
Great!
Hello, Hello, how are you?<br />
Hello, Hello, how are you?
Hello, Hello, How are you?<br />
How are you today?";
$occurrences = substr_count($txt, '<br />');
if( 1 === $occurrences ) {
$txt = str_replace('<br />', "<img>", $txt);
} else {
$counter = 1;
$txt = preg_replace_callback("/<br \/>/", function ($m) use (&$counter) {
// replace 4th occurance
if ($counter++ == 4) {
return "<img>";
}
return $m[0];
}, $txt );
}
echo $txt;
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