php的字符串用法小结

1 求长度，最基本的

$text = "sunny day";

$count = strlen($text); // $count = 9






2 字符串截取
截取前多少个字符

$article = "BREAKING NEWS: In ultimate irony, man bites dog."; $summary = substr_replace($article, "...", 40);




3 算单词数

$article = "BREAKING NEWS: In ultimate irony, man bites dog."; $wordCount = str_word_count($article);

// $wordCount = 8




4 将字符串变成HTML的连接
$url = "W.J. Gilmore, LLC ()";

$url = preg_replace("/http://([A-z0-9./-]+)/", "$0", $url);




5 去除字符中的HTML字符串
$text = strip_tags($input, "

");



6 nl2br:

$comment = nl2br($comment);

变成带HTML格式



7 Wordwrap

限制每行字数

$speech = "Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.";

echo wordwrap($speech, 30);



输出：

Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.
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