This function returns a string or an array with all occurrences of
search in subject
replaced with the given replace value. If you
don't need fancy replacing rules (like regular expressions), you should
always use this function instead of ereg_replace() or
preg_replace().
As of PHP 4.0.5, every parameter in str_replace()
can be an array.
Warning
In PHP versions prior to 4.3.3 a bug existed when using arrays as
both search and replace
parameters which caused empty search indexes
to be skipped without advancing the internal pointer on the
replace array. 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 mimick the original behavior.
If subject is an array, then the search
and replace is performed with every entry of
subject, and the return value is an array
as well.
If search and
replace are arrays, then
str_replace() takes a value from each array
and uses them to do search and replace on
subject. If
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.
If search or replace
are arrays, their elements are processed first to last.
// 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");
// Use of the count parameter is available as of PHP 5.0.0 $str = str_replace("ll", "", "good golly miss molly!", $count); echo $count; // 2
// Order of replacement $str = "Line 1\nLine 2\rLine 3\r\nLine 4\n"; $order = array("\r\n", "\n", "\r"); $replace = '<br />'; // Processes \r\n's first so they aren't converted twice. $newstr = str_replace($order, $replace, $str);
?>
Note: This function is
binary-safe.
Note:
As of PHP 5.0.0 the number of matched and replaced
needles (search) will be returned in
count which is passed by reference.
Prior to PHP 5.0.0 this parameter is not available.
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