Question

我有一个代码来显示两个句子之间的差异。但我需要检查没有区分大小写。

<?php

function get_decorated_diff($old, $new){
    $from_start = strspn($old ^ $new, "\0");        
    $from_end = strspn(strrev($old) ^ strrev($new), "\0");

    $old_end = strlen($old) - $from_end;
    $new_end = strlen($new) - $from_end;

    $start = substr($new, 0, $from_start);
    $end = substr($new, $new_end);
    $new_diff = substr($new, $from_start, $new_end - $from_start);  
    $old_diff = substr($old, $from_start, $old_end - $from_start);

    $new = "$start<ins style='background-color:#ccffcc'>$new_diff</ins>$end";
    $old = "$start<del style='background-color:#ffcccc'>$old_diff</del>$end";
    return array("old"=>$old, "new"=>$new);
}


$string_old = "Hello World!";
$string_new = "hello world!";
$diff = get_decorated_diff($string_old, $string_new);
echo "<table>
    <tr>
        <td>".$diff['old']."</td>
        <td>".$diff['new']."</td>
    </tr>
</table>";
?>

它显示Hello和hello的差异。但我需要在没有区分大小写的情况下显示差异

Answer 1

尝试在一个案例中创建所有字符串，例如

function get_decorated_diff($old, $new){
    $originalOld = $old;
    $originalNew = $new;
    $old = strtolower($old); //Add this line
    $new = strtolower($new); //Add this line

    $from_start = strspn($old ^ $new, "\0");        
    $from_end = strspn(strrev($old) ^ strrev($new), "\0");

    $old_end = strlen($old) - $from_end;
    $new_end = strlen($new) - $from_end;

    $start = substr($new, 0, $from_start);
    $end = substr($new, $new_end);
    $new_diff = substr($originalNew, $from_start, $new_end - $from_start);  
    $old_diff = substr($originalOld, $from_start, $old_end - $from_start);

    $new = "$start<ins style='background-color:#ccffcc'>$new_diff</ins>$end";
    $old = "$start<del style='background-color:#ffcccc'>$old_diff</del>$end";
    return array("old"=>$old, "new"=>$new);
}

Answer 2

你可以在函数开头设置为小写

 function get_decorated_diff($old, $new){
    $old = strlower($old);
    $new = strlower($new);

    $from_start = strspn($old ^ $new, "\0");   
     .......

如果您需要保留原始值，您可以制作副本以便稍后返回原始内容

Answer 3

将其设为小写并进行比较

$old_lower = strlower($old);
$new_lower = strlower($new);
$from_start = strspn($old_lower ^ $new_lower, "\0");

要使用不区分大小写的方式比较字符串，请使用strcasecmp：

<?php
$string_old = "Hello World!";
$string_new = "hello world!";
if (strcasecmp($string_old, $string_new) == 0) {
    echo '$string_old is equal to $string_new in a case-insensitive string comparison';
}
else {
    echo = 'there is difference between $string_old with $string_new';
}
?>

Answer 4

由于（'a'^'A'）=''即空格字符，无论如何都可以使用此代码进行比较：

$from_start = strspn($old ^ $new, "\0 ");        
$from_end = strspn(strrev($old) ^ strrev($new), "\0 ");

但是，当要比较的字符不是字母时，它也会有错误匹配。

比较两个，并使用PHP找到两个字符串之间的差异

4 个答案: