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PHP substr_count() 函数
tryphp_func_string_substr_count2
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<!DOCTYPE html> <html> <body> <?php $str = "This is nice"; echo strlen($str)."<br>"; // Using strlen() to return the string length echo substr_count($str,"is")."<br>"; // The number of times "is" occurs in the string echo substr_count($str,"is",2)."<br>"; // The string is now reduced to "is is nice" echo substr_count($str,"is",3)."<br>"; // The string is now reduced to "s is nice" echo substr_count($str,"is",3,3)."<br>"; // The string is now reduced to "s i" ?> </body> </html>