(php 4, PHP 5)
str_replace ― Replace all occurrences of the search string with the replacement string
mixed str_replace ( mixed
$search , mixed
$replace , mixed
$subject [, int
&$count ] )
This function returns a string or an array with all occurrences of
subject replaced with the given
If you don’t need fancy replacing rules (like regular expressions), you should always use this function instead ofpreg_replace().
replace are arrays, then str_replace() takes a value from each array and uses them to search and replace on
replace has fewer values than
search, then an empty string is used for the rest of replacement values. If
search is an array and
replace is a string, then this replacement string is used for every value of
search. The converse would not make sense, though.
replace are arrays, their elements are processed first to last.
The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.
The replacement value that replaces found
searchvalues. An array may be used to designate multiple replacements.
The string or array being searched and replaced on, otherwise known as the haystack.
subjectis an array, then the search and replace is performed with every entry of
subject, and the return value is an array as well.
If passed, this will be set to the number of replacements performed.
This function returns a string or an array with the replaced values.
Version Description 5.0.0 The
countparameter was added.
4.3.3 The behaviour of this function changed. In older versions a bug existed when using arrays as both
replaceparameters which caused empty
searchindexes to be skipped without advancing the internal pointer on the
replacearray. This has been corrected in PHP 4.3.3, any scripts which relied on this bug should remove empty search values prior to calling this function in order to mimic the original behavior.
4.0.5 Most parameters can now be an array.
Example #1 Basic str_replace() examples
$bodytag = str_replace("%body%", "black", "");
// Provides: Hll Wrld f PHP
$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
$onlyconsonants = str_replace($vowels, "", "Hello World of PHP");
// Provides: You should eat pizza, beer, and ice cream every day
$phrase = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);
// Provides: 2
$str = str_replace("ll", "", "good golly miss molly!", $count);
Example #2 Examples of potential str_replace() gotchas
// Order of replacement
$str = "Line 1/nLine 2/rLine 3/r/nLine 4/n";
$order = array("/r/n", "/n", "/r");
$replace = '
// Processes /r/n's first so they aren't converted twice.
$newstr = str_replace($order, $replace, $str);
// Outputs F because A is replaced with B, then B is replaced with C, and so on...
// Finally E is replaced with F, because of left to right replacements.
$search = array('A', 'B', 'C', 'D', 'E');
$replace = array('B', 'C', 'D', 'E', 'F');
$subject = 'A';
echo str_replace($search, $replace, $subject);
// Outputs: apearpearle pear
// For the same reason mentioned above
$letters = array('a', 'p');
$fruit = array('apple', 'pear');
$text = 'a p';
$output = str_replace($letters, $fruit, $text);
Note: This function is binary-safe.