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A brief discussion on PHP string reversal. Problems often encountered in interviews
A brief discussion on PHP string reversal. Problems often encountered in interviews
The editor below will share with you a brief discussion on PHP string reversal. Questions often encountered in interviews have good reference value. I hope it will be helpful to everyone. Let’s follow the editor and take a look.
1. Single-byte string reversal
php provides for string reversal The function strrev()
$str = 'abcdef'; echo strrev($str);
2. For multi-byte strings containing Chinese, you need to use mb_substr()
$str = '字符串反转';
function rev($str, $encoding = 'utf-8'){
$len = mb_strlen($str);
$result = '';
for ($i = $len-1; $i>=0; $i--){
$result.= mb_substr($str,$i,1,$encoding);
}
return $result;
}
echo rev($str);3. Algorithm to realize first exchange
$str = 'abcdefg';
$len = strlen($str);
$times = $len/2;
for($i = 0;$i <= $times; $i++ ){
$tmp = $str[$i];
$str[$i] = $str[$len-$i-1];
$str[$len-$i-1] = $tmp;
}
echo $str;The above article briefly talks about PHP string reversal that is often encountered in the interview. This is all the content shared by the editor. I hope it can give you a reference, and I also hope that everyone will support the PHP Chinese website. .
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