String manipulation-intercept string length code snippet

Some of the commonly used string manipulation features in projects include: intercept string lengths, output conversions, random strings, full-width half-width conversions, character set conversions, mailbox format validation, and digital to file size.

Intercept String length code snippet:

<span style= "FONT-FAMILY:SIMSUN;FONT-SIZE:12PX;" >/** * Intercept length * @param unknown $STR * @param number $start * @param unknown $length * @param string $charset * @param str ing $suffix * @return mixed|string */public static function Getcsubstr ($STR, $start =0, $length, $charset = "Utf-8", $suffix = true) {$charset =empty ($charset)? ' Utf-8 ': $charset; $search =array (' (\\\$[a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) (\[[a-za-z0-9\-\.\[\]_\ "\ ' \$\ X7f-\xff]+\]) ', '/< (/?) (script|i?frame|style|html|body|title|link|meta|\?| \%) ([^>]*?) >/isu ',//Remove JavaScript '/(<[^>]*) on[a-za-z] \s*= ([^>]*>)/isu ', '/<[\/\! ' *? [^<>]*?>/si ',//Remove HTML tags '/([\ r \ n]) [\s]+/i ',//remove whitespace characters '/& (quot| #34);/I ',//Replace HTML entity '/& (amp| #38); I ', '/& (lt| #60);/I ', '/& (gt| #62);/I ', '/& (nbsp| #160);/I ', '/& (iexcl| #161);/I ', '/& (cent| #162); I ', '/& (pound| #163);/I ', '/& (copy| #169);/I ', '/&# (\d+);/E ', '/<\?/si ', '/\?>/si '); $replace =array ( ' ([a-za-z_\x7f-\xff][a-za-z0-9_\x7f-\xff]*) ', ' <\\1\\2\\3> ', ' \\1\\2 ', "", "\ r \ n", "," "," "," "," "," "," ",", "", "", "", "", "", "<? ', '?> '); $str =preg_replace ($search, $ Replace, $STR), if (Function_exists ("Mb_substr")) {if (Mb_strlen ($str, $charset) <= $length) {return $str;} $slice =mb_substr ($str, $start, $length, $charset);} else{$re [' utf-8 ']= '/[\x01-\x7f]|[ \xc2-\xdf][\x80-\xbf]| [\xe0-\xef] [\X80-\XBF] {2}| [\xf0-\xff] [\X80-\XBF] {3}/"; $re [' gb2312 ']="/[\x01-\x7f]| [\xb0-\xf7] [\xa0-\xfe]/]; $re [' GBK ']= '/[\x01-\x7f]| [\x81-\xfe] [\x40-\xfe]/]; $re [' Big5 ']= '/[\x01-\x7f]| [\x81-\xfe] ([\x40-\x7e]|\xa1-\xfe]) /";p Reg_match_all ($re [$charset], $str, $match), if (!empty ($match [0]) &&count ($match [0]) <= $length) { return $STR;} $slice =join ("", Array_slice ($match [0], $start, $length));} if ($suffix) {return $slice. " ...";} return $slice;} </span>

Main code Features:
Free to intercept the strings in English and Chinese,
Automatically process HTML code,
HTML AutoComplete (For more information: HTML tag completion for Web content and filtering methods)
Achieve the accuracy of capturing the word count of various encoded content,
Segmentation is automatically differentiated by string encoding.
The main functions apply:
Array_slice-takes a paragraph out of the array, and defaults to reordering and resetting the array's numeric index.

Preg_replace: For more information: PHP using regular expressions to find replacement strings

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String manipulation-intercept string length code snippet