/
zad.php
97 lines (66 loc) · 1.82 KB
/
zad.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
<?php
namespace forlightsoft;
/**
* This is a test class.
* It consists of functions which can be used to check if a string is palindrome or
* if a string has a palindrome substring.
*
*
*/
class Palindrome
{
/**
* Converts a string to lower case.
* Deletes symbols " ", ".", ",", "-", "!", "?", ":", ";", "\"" from a string.
*
* @param string $str
* @return string
*/
public static function purify($str)
{
$symb = array(" ", ".", ",", "-", "!", "?", ":", ";", "\"" );
$strlc = mb_strtolower($str);
return str_replace($symb, '', $strlc);
}
/**
* Checks if a string is a palindrome.
*
* @param string $str
* @return boolean
*/
public static function isPalindrome($str)
{
$purestr = self::purify($str);
for ($i=1; $i<=mb_strlen($purestr)/2; $i++){
if (!(mb_substr($purestr, $i-1, 1) == mb_substr($purestr, mb_strlen($purestr)-$i, 1))){
return false;
}
}
return true;
}
/**
* Checks if a string has palindrome substring.
* If it has, returns such substring with max length.
* if no such a substring returns first letter of a string.
* @param string $str
* @return string
*/
public static function getMaxPalindrome($str)
{
$l = mb_strlen($str);
for ($i=$l; $i>1; $i--){
for ($j=1; $j<=$l-$i+1; $j++){
if (self::isPalindrome(mb_substr($str, $j-1, $i))){
return mb_substr($str, $j-1, $i);
};
}
}
return mb_substr($str, 0, 1);
}
}
$str = 'gggПаліндром - і ні морд, ні лап';
if (Palindrome::isPalindrome($str)){
echo 'Палиндром:'.$str;
}
else{
echo 'Не палиндром <br>', Palindrome::getMaxPalindrome($str);}