Definition and Usage
定义和用法

The levenshtein() function returns the Levenshtein distance between two strings.
levenshtein()函数的作用是：计算两个字符串的Levenshtein距离。

The Levenshtein distance is the number of characters you have to replace, insert or delete to transform string1 into string2.
Levenshtein distance表示的是：你需要替代、插入以及删除的字符数量。

By default, PHP gives each operation (replace, insert, and delete) equal weight. However, you can define the cost of each operation by setting the optional insert, replace, and delete parameters.
在默认情况下，PHP赋予了每项操作（替代、插入、删除）以相同的功能。然而，你可以通过设置可选参数（插入、替代、删除）来定义每项操作的所指定的成本[cost]。

Syntax
语法

levenshtein(string1,string2,insert,replace,delete)

Tips and Notes
提示和注意点

Note: The levenshtein() function returns -1 if one of the strings exceeds 255 characters.
注意：如果字符串中的字符总数超过255，levenshtein()函数将返回-1。

Note: The levenshtein() function is not case-sensitive.
注意：levenshtein()函数不区分大小写。

Note: The levenshtein() function is faster than the similar_text() function. However, similar_text() will give you a more accurate result with less modifications needed.
注意：levenshtein()函数的运行速度要快于similar_text()函数。然而，similar_text()函数将会给出相对于levenshtein()函数而言更精确的结果，并且你无需对其进行过多修改。

Example
案例

<?php
echo levenshtein("Hello World","ello World");
echo "<br />";
echo levenshtein("Hello World","ello World",10,20,30);
?>

The output of the code above will be:
上述代码将输出下面的结果：

1
30

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