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 = ["hat","Cat","sAt","maT"];
for( $j= 0; $j < count($arr_query_words); $j++ ){
$story_body = str_replace(
$arr_query_words[ $j 开发者_运维问答],
'<span style=" background-color:yellow; ">' . $arr_query_words[ $j ] . '</span>',
$story_body
);
}
Is there a way to carry out the replace even if the case is different?
Use str_ireplace
to perform a case-insensitive string replacement (str_ireplace
is available from PHP 5):
$story_body = str_ireplace($arr_query_words[$j],
'<span style=" background-color:yellow; ">'. $arr_query_words[$j]. '</span>',
$story_body);
To case-insensitively compare strings, use strcasecmp
:
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>
The easiest, and most widely supported way to achieve this is possibly to lowercase both strings before comparing them, like so:
if(strtolower($var1) == strtolower($var2)) {
// Equals, case ignored
}
You might want to trim the strings being compared, simply use something like this to achieve this functionality:
if(strtolower(trim($var1)) == strtolower(trim($var2))) {
// Equals, case ignored and values trimmed
}
$var1 = "THIS is A teST";
$var2 = "this is a tesT";
if (strtolower($var1) === strtolower($var2) ) {
echo "var1 and var2 are same";
}
strtolower
converts string to lowercase
if(!strcasecmp($str1, $str2)) ... //they are equals ignoring case
strcasecmp returns 0 only if strings are equals ignoring case, so !strcasecmp return true if they are equals ignoring case, false otherwise
http://php.net/manual/en/function.strcasecmp.php
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