How to implement interception and replacement in php

How to implement interception and replacement in php: 1. Implement string interception through the substr function in php and the customized substr_cut method; 2. Implement string replacement through the str_replace function in php.

#The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

1. String interception

Supports mixed Chinese and English interception.

/* ------------------------------------------------------ 参数： $str_cut 需要截断的字符串 $length 允许字符串显示的最大长度 程序功能：截取全角和半角（汉字和英文）混合的字符串以避免乱码 ------------------------------------------------------ */ function substr_cut($str_cut,$length) { if (strlen($str_cut) > $length) { for($i=0; $i < $length; $i++) if (ord($str_cut[$i]) > 128) $i++; $str_cut = substr($str_cut,0,$i).".."; } return $str_cut; } ?>

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2. String replacement

str_replace("iwind", "kiki", "i love iwind, iwind said");

will output " i love kiki, kiki said"

str_replace(find,replace,string,count)

find required. Specifies the value to look for.

replace Required. Specifies the value to replace the value in find.

string Required. Specifies the string to be searched for.

count Optional. A variable counting the number of substitutions.

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