1 求長度，最基本的
$text = "sunny day";
$count = strlen($text); // $count = 9


2 字符串截取
截取前多少個字符
$article = "BREAKING NEWS: In ultimate irony, man bites dog."; $summary = substr_replace($article, "...", 40);

3 算單詞數(shù)
$article = "BREAKING NEWS: In ultimate irony, man bites dog."; $wordCount = str_word_count($article);
// $wordCount = 8

4 將字符串變成HTML的連接
$url = "W.J. Gilmore, LLC (http://m.fzitv.net)";
$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);
變成帶HTML格式

7 Wordwrap
限制每行字數(shù)
$speech = "Four score and seven years ago our fathers brought forth, upon this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.";
echo wordwrap($speech, 30);

輸出：
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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