PHP to remove duplicate string program code

Regular expressions

The code is as follows	Copy Code
echo Preg_replace ("/([^s]+) *\1{2,} ([^s]+) * *", ", $string);

With the loop I wrote a

Example 1

The code is as follows	Copy Code
$str = ' ABCCBA 9872223s 12121212 ddd 1234560 vbwwc asasasasas zxzx '; $source _array = Explode ("", $str); foreach ($source _array as $key => $item) { $current _str = Str_split ($item, 1); $current _array=array_count_values ($current _str); foreach ($current _array as $k => $it) { if ($it >=3) unset ($source _array[$key]); } } Var_dump ($source _array);

Example 2

code is as follows

copy code

<?php $str = ' ant Ant College College, I Love love love Loves Love You!522200011111333311111444 '; function Mbstringtoarray ($STR, $charset) {   $strlen =mb_strlen ($STR);   while ($strlen) {      $array []=mb_substr ($str, 0,1, $charset);     $str =mb_substr ($str, 1, $strlen, $charset);     $strlen =mb_strlen ($STR);  }   return $array; } $arr = Mbstringtoarray ($str, "GBK"); //split string $arr = Array_unique ($arr);           //Filter repeat character $str = Implode (', $arr);            //merge array Echo $str;

Another way

Preg_replace_callback () is simpler, but preg_replace () can use the E modifier to achieve preg_replace_eval, which can be achieved

Pretty much the effect.

The code is as follows	Copy Code
echo preg_replace ('/([^s]+)/e ', ' Check (' \1 ') ', $string); function Check ($STR) { $tmp =count_chars ($STR, 1); Sort ($tmp); Return Array_pop ($tmp) >2? ": $str; }