PHP Source Analysis DZX1.5 string truncation function Cutstr usage

This article describes the PHP source code analysis of the DZX1.5 string truncation function cutstr usage. Share to everyone for your reference. The specific analysis is as follows:

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<?php/** * Function source DZX1.5, file location/source/function/function_core.php * * Define (' CHARSET ', ' UTF-8 '); function Cutstr ($string, $length, $dot = "...") {if strlen ($string) <= $length) {return $string;} if (Strtolower ( CHARSET = = "Utf-8") {$n = $tn = $noc = 0 while ($n < strlen ($string)) {$t = Ord ($string [$n]); if ($t = 9 | | $t = 10 || (<= $t && $t <= 126)) {$tn = 1; $n + +; $noc + +;} ElseIf (194 <= $t && $t <= 223) {$tn = 2; $n + = 2; $noc + 2;} elseif (224 <= $t && $t <= 239) {$tn = 3; $n + = 3; $noc + = 2;} elseif (<= $t && $t <= 247) {$tn = 4; $n + 4; $noc + 2;} elseif (248 <= $t && $t <= 251) {$tn = 5; $n + + 5; $noc + 2;} elseif ($t = = 252 | | $t = = 253) {$tn = 6; $n + 6; $noc + 2; else {$n + +;} if ($noc >= $length) {break;}} if ($noc > $length) {$n-= $tn;} $strcut = substr ($string, 0, $n); else {for ($i = 0; $i < $length $i + +) {$strcut. = Ord ($string [$i]) >127 $string [$i]. $string [+ + $i]: $string [$i] ; }} $pos = Strrpos ($strcut, Chr (1)); if ($pos!== false) {$strcut = substr ($strcut, 0, $pos);} return $strcut. $dot; $string = ' Test database ablci102020@ (#)!)! Test Labor DDK '; Echo Cutstr ($string, 15); /*end of php*/

The results of the operation are as follows:

Test Database ablci1020 ...

I hope this article will help you with your PHP program design.