说明
array|string
$search
,array|string
$replace
,string|array
$subject
,int
&$count
= null
): string|array
该函数返回字符串或者数组。该字符串或数组是将 subject
中全部的 search
都被 replace
替换(忽略大小写)之后的结果。
要根据模式而不是固定字符串替换文本,将 preg_replace() 与 i
模式修饰符一起使用。
参数
如果 search
和 replace
为数组,那么 str_ireplace() 将对 subject
做二者的映射替换。如果 replace
的值的个数少于 search
的个数,多余的替换将使用空字符串来进行。如果 search
是一个数组而 replace
是一个字符串,那么 search
中每个元素的替换将始终使用这个字符串。
如果 search
或 replace
是数组,他们的元素将从头到尾一个个处理。
search
-
要搜索的值,就像是 needle。可以使用 array 来提供多个 needle。
replace
-
search
的替换值。一个数组可以被用来指定多重替换。 subject
-
要被搜索和替换的字符串或数组,就像是 haystack。
如果
subject
是一个数组,替换操作将遍历整个subject
,并且也将返回一个数组。 count
-
如果被指定,它的值将被设置为替换发生的次数。
返回值
返回替换后的字符串或者数组。
更新日志
版本 | 说明 |
---|---|
8.2.0 | 大小写转换不在依赖于使用 setlocale() 设置的区域。只会进行 ASCII 大小写转换。非 ASCII 字节值将通过它们的字节值进行比较。 |
示例
示例 #1 str_ireplace() 示例
<?php
$bodytag = str_ireplace("%body%", "black", "<body text=%BODY%>");
echo $bodytag; // <body text=black>
?>
注释
注意: 此函数可安全用于二进制对象。
替换顺序陷阱
因为 str_ireplace() 是从左到右替换,当进行多个替换时,可能会替换先前插入的值。str_replace() 文档中的示例 #2 展示了在实践中受到的影响。
用户贡献的备注 11 notes
Attention! str_ireplace does not destroy multibyte characters. But multibyte characters are not replaced case-insensitively.
<?php
echo str_ireplace('Ä', 'Ae_', 'Ägypten'); // Ae_gypten
echo str_ireplace('ä', 'ae_', 'ägypten'); // ae_gypten
echo str_ireplace('ä', 'ae_', 'Ägypten'); // Ägypten
echo str_ireplace('Ä', 'ae_', 'ägypten'); // ägypten
echo str_ireplace('E', 'e_', 'egypt'); // e_gypt
echo str_ireplace('e', 'e_', 'Egypt'); // e_gypt
echo str_ireplace('ä', 'ae_', mb_strtolower('Ägypten')); // ae_gypten
Here's a different approach to search result keyword highlighting that will match all keyword sub strings in a case insensitive manner and preserve case in the returned text. This solution first grabs all matches within $haystack in a case insensitive manner, and the secondly loops through each of those matched sub strings and applies a case sensitive replace in $haystack. This way each unique (in terms of case) instance of $needle is operated on individually allowing a case sensitive replace to be done in order to preserve the original case of each unique instance of $needle.
<?php
function highlightStr($haystack, $needle, $highlightColorValue) {
// return $haystack if there is no highlight color or strings given, nothing to do.
if (strlen($highlightColorValue) < 1 || strlen($haystack) < 1 || strlen($needle) < 1) {
return $haystack;
}
preg_match_all("/$needle+/i", $haystack, $matches);
if (is_array($matches[0]) && count($matches[0]) >= 1) {
foreach ($matches[0] as $match) {
$haystack = str_replace($match, '<span style="background-color:'.$highlightColorValue.';">'.$match.'</span>', $haystack);
}
}
return $haystack;
}
?>
here's a neat little function I whipped up to do HTML color coding of SQL strings.
<?php
/**
* Output the HTML debugging string in color coded glory for a sql query
* This is very nice for being able to see many SQL queries
* @access public
* @return void. prints HTML color coded string of the input $query.
* @param string $query The SQL query to be executed.
* @author Daevid Vincent [daevid@LockdownNetworks.com]
* @version 1.0
* @date 04/05/05
* @todo highlight SQL functions.
*/
function SQL_DEBUG( $query )
{
if( $query == '' ) return 0;
global $SQL_INT;
if( !isset($SQL_INT) ) $SQL_INT = 0;
//[dv] this has to come first or you will have goofy results later.
$query = preg_replace("/['\"]([^'\"]*)['\"]/i", "'<FONT COLOR='#FF6600'>$1</FONT>'", $query, -1);
$query = str_ireplace(
array (
'*',
'SELECT ',
'UPDATE ',
'DELETE ',
'INSERT ',
'INTO',
'VALUES',
'FROM',
'LEFT',
'JOIN',
'WHERE',
'LIMIT',
'ORDER BY',
'AND',
'OR ', //[dv] note the space. otherwise you match to 'COLOR' ;-)
'DESC',
'ASC',
'ON '
),
array (
"<FONT COLOR='#FF6600'><B>*</B></FONT>",
"<FONT COLOR='#00AA00'><B>SELECT</B> </FONT>",
"<FONT COLOR='#00AA00'><B>UPDATE</B> </FONT>",
"<FONT COLOR='#00AA00'><B>DELETE</B> </FONT>",
"<FONT COLOR='#00AA00'><B>INSERT</B> </FONT>",
"<FONT COLOR='#00AA00'><B>INTO</B></FONT>",
"<FONT COLOR='#00AA00'><B>VALUES</B></FONT>",
"<FONT COLOR='#00AA00'><B>FROM</B></FONT>",
"<FONT COLOR='#00CC00'><B>LEFT</B></FONT>",
"<FONT COLOR='#00CC00'><B>JOIN</B></FONT>",
"<FONT COLOR='#00AA00'><B>WHERE</B></FONT>",
"<FONT COLOR='#AA0000'><B>LIMIT</B></FONT>",
"<FONT COLOR='#00AA00'><B>ORDER BY</B></FONT>",
"<FONT COLOR='#0000AA'><B>AND</B></FONT>",
"<FONT COLOR='#0000AA'><B>OR</B> </FONT>",
"<FONT COLOR='#0000AA'><B>DESC</B></FONT>",
"<FONT COLOR='#0000AA'><B>ASC</B></FONT>",
"<FONT COLOR='#00DD00'><B>ON</B> </FONT>"
),
$query
);
echo "<FONT COLOR='#0000FF'><B>SQL[".$SQL_INT."]:</B> ".$query."<FONT COLOR='#FF0000'>;</FONT></FONT><BR>\n";
$SQL_INT++;
} //SQL_DEBUG
?>
If you follow the instructions given here you will end up with code which works in php5.3 but which bugs-out in php5.4. Reason is that '&$count' (explicit pass by reference) is now an illegal construct.
Nasty, especially it leads to unreliable code which may work on test but not in production. Manual needs corrected!
FIX-ed problem with highlighting second 'o' OR 'a', in this string
<?php
function highlight_string ($haystack, $needle, $highlight_class) {
// return $haystack if there is no highlight color or strings given, nothing to do.
$first_encode='XXXXXXXXXXXXXXX'; //ENCODE string
$second_encode='YYYYYYYYYYYYYYY';
preg_match_all("/$needle+/i", $haystack, $matches);
if (is_array($matches[0]) && count($matches[0]) >= 1) {
foreach ($matches[0] as $match) {
$haystack = str_replace($match, $first_encode.$match.$second_encode, $haystack);
}
}
$haystack=str_replace(array($first_encode,$second_encode),
array('<font class="'.$highlight_class.'" >','</font>'),$haystack);
return $haystack;
}
?>
This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat
For highlighting without the overhead of regex and without destroying capitalization, try this:
<?php
function highlight($needle, $haystack){
$ind = stripos($haystack, $needle);
$len = strlen($needle);
if($ind !== false){
return substr($haystack, 0, $ind) . "<b>" . substr($haystack, $ind, $len) . "</b>" .
highlight($needle, substr($haystack, $ind + $len));
} else return $haystack;
}
?>
This example uses HTML bold tags, but you can easily change the highlighting method.
This function will highlight search terms (Key Words in Context).
The difference between this one and the ones below is that it will preserve the original case of the search term as well. So, if you search for "american" but in the original string it is "American" it will retain the capital "A" as well as the correct case for the rest of the string.
<?php
function kwic($str1,$str2) {
$kwicLen = strlen($str1);
$kwicArray = array();
$pos = 0;
$count = 0;
while($pos !== FALSE) {
$pos = stripos($str2,$str1,$pos);
if($pos !== FALSE) {
$kwicArray[$count]['kwic'] = substr($str2,$pos,$kwicLen);
$kwicArray[$count++]['pos'] = $pos;
$pos++;
}
}
for($I=count($kwicArray)-1;$I>=0;$I--) {
$kwic = '<span class="kwic">'.$kwicArray[$I]['kwic'].'</span>';
$str2 = substr_replace($str2,$kwic,$kwicArray[$I]['pos'],$kwicLen);
}
return($str2);
}
?>
Note that character case is being defined by your server's locale setting, which effects strings containing non-ASCII characters.
See strtolower() - http://www.php.net/strtolower and comments - internally str_ireplace converts $search and $replace to lowercase to find matches.
Warning with highlighting ...
I used :
<?php
$text = preg_replace('/('.$q.')/i','<span class=highlighting "">$1</span>' , $text);
?>
Because this line do not allow to highlight uppercase and lowercase correctly (transform uppercase to lowercase for exemple)
<?php
$text = str_ireplace( $q , '<span class=highlighting "">'.$q.'</span>', $text);
?>
But when $q contain some regex you have some problems ... for exemple :
<?php $q = '('; ?>
So you must use preg_replace to highlight correctly the text and you must create a function for escape bad regex caracters !
I think that a better function can be found but this works I guess :
<?php
function regex_escape( $q )
{
return preg_replace('/([\[\]\(\)\{\}\-\.\*\?\|\^\$])/', '\$1', $q);
}
?>
备份地址:http://www.lvesu.com/blog/php/function.str-ireplace.php