在PHP中比较字符串时忽略大小写 [英] Ignore case sensitivity when comparing strings in PHP

问题描述

我正在尝试比较单词的相等性，而大小写无关. 但是PHP似乎不同意！关于如何强迫PHP在比较单词时忽略单词大小写的任何想法?

I'm trying to compare words for equality, and the case [upper and lower] is irrelevant. However PHP does not seem to agree! Any ideas as to how to force PHP to ignore the case of words while comparing them?

$arr_query_words = array( "hat","Cat","sAt","maT" );
// for each element in $arr_query_words -
for( $j= 0; $j < count( $arr_query_words ); $j++ ){

    // Split the $query_string on "_" or "%" :
    $story_body = str_replace( $arr_query_words[ $j ],
         '<span style=" background-color:yellow; ">' . $arr_query_words[ $j ] . '</span>',
               $story_body );

// --- This ONLY replaces where the case [upper or lower] is identical ->
}

即使情况不同，是否有办法进行替换?

Is there a way to carry out the replace even if the case is different?

推荐答案

使用 str_ireplace 执行不区分大小写的字符串替换(PHP 5中提供了str_ireplace):

$story_body = str_ireplace($arr_query_words[$j],
   '<span style=" background-color:yellow; ">'. $arr_query_words[$j]. '</span>',
    $story_body);

要以不区分大小写的方式比较字符串，请使用 strcasecmp :

To case-insensitively compare strings, use strcasecmp:

<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
    echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>

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