phpstudy所有软件,已经通过360安全检测认证,phpstudy linux web面板(docker),已发布安全检测与修复

levenshtein

  • 30

levenshtein

(PHP 4 >= 4.0.1, PHP 5)

levenshteinCalculate Levenshtein distance between two strings

说明

int levenshtein ( string $str1 , string $str2 ) int levenshtein ( string $str1 , string $str2 , int $cost_ins , int $cost_rep , int $cost_del )

The Levenshtein distance is defined as the minimal number of characters you have to replace, insert or delete to transform str1 into str2. The complexity of the algorithm is O(m*n), where n and m are the length of str1 and str2 (rather good when compared to similar_text(), which is O(max(n,m)**3), but still expensive).

In its simplest form the function will take only the two strings as parameter and will calculate just the number of insert, replace and delete operations needed to transform str1 into str2.

A second variant will take three additional parameters that define the cost of insert, replace and delete operations. This is more general and adaptive than variant one, but not as efficient.

参数

str1

One of the strings being evaluated for Levenshtein distance.

str2

One of the strings being evaluated for Levenshtein distance.

cost_ins

Defines the cost of insertion.

cost_rep

Defines the cost of replacement.

cost_del

Defines the cost of deletion.

返回值

This function returns the Levenshtein-Distance between the two argument strings or -1, if one of the argument strings is longer than the limit of 255 characters.

范例

Example #1 levenshtein() example

<?php
// input misspelled word
$input 'carrrot';

// array of words to check against
$words  = array('apple','pineapple','banana','orange',
                
'radish','carrot','pea','bean','potato');

// no shortest distance found, yet
$shortest = -1;

// loop through words to find the closest
foreach ($words as $word) {

    
// calculate the distance between the input word,
    // and the current word
    
$lev levenshtein($input$word);

    
// check for an exact match
    
if ($lev == 0) {

        
// closest word is this one (exact match)
        
$closest $word;
        
$shortest 0;

        
// break out of the loop; we've found an exact match
        
break;
    }

    
// if this distance is less than the next found shortest
    // distance, OR if a next shortest word has not yet been found
    
if ($lev <= $shortest || $shortest 0) {
        
// set the closest match, and shortest distance
        
$closest  $word;
        
$shortest $lev;
    }
}

echo 
"Input word: $input ";
if (
$shortest == 0) {
    echo 
"Exact match found: $closest ";
} else {
    echo 
"Did you mean: $closest? ";
}

?>

以上例程会输出:

Input word: carrrot
Did you mean: carrot?

参见


  • addcslashes
  • addslashes
  • bin2hex
  • chop
  • chr
  • chunk_split
  • convert_cyr_string
  • convert_uudecode
  • convert_uuencode
  • count_chars
  • crc32
  • crypt
  • echo
  • explode
  • fprintf
  • get_html_translation_table
  • hebrev
  • hebrevc
  • hex2bin
  • htmlentities
  • htmlspecialchars
  • htmlspecialchars_decode
  • html_entity_decode
  • implode
  • join
  • levenshtein
  • localeconv
  • ltrim
  • md5
  • md5_file
  • metaphone
  • money_format
  • nl2br
  • nl_langinfo
  • number_format
  • ord
  • parse_str
  • print
  • printf
  • quoted_printable_decode
  • quoted_printable_encode
  • quotemeta
  • rtrim
  • setlocale
  • sha1
  • sha1_file
  • similar_text
  • soundex
  • sprintf
  • sscanf
  • strcasecmp
  • strchr
  • strcmp
  • strcoll
  • strcspn
  • stripcslashes
  • stripos
  • stripslashes
  • strip_tags
  • stristr
  • strlen
  • strnatcasecmp
  • strnatcmp
  • strncasecmp
  • strncmp
  • strpbrk
  • strpos
  • strrchr
  • strrev
  • strripos
  • strrpos
  • strspn
  • strstr
  • strtok
  • strtolower
  • strtoupper
  • strtr
  • str_getcsv
  • str_ireplace
  • str_pad
  • str_repeat
  • str_replace
  • str_rot13
  • str_shuffle
  • str_split
  • str_word_count
  • substr
  • substr_compare
  • substr_count
  • substr_replace
  • trim
  • ucfirst
  • ucwords
  • vfprintf
  • vprintf
  • vsprintf
  • wordwrap
  • PHP MySQL HTML CSS JavaScript MSSQL AJAX .NET JSP Linux Mac ASP 服务器 SQL jQuery C# C++ java Android IOS oracle MongoDB SQLite wamp 交通频道

    微信扫码登陆

    打开 微信
    扫一扫登录