str_replace
(PHP 4, PHP 5, PHP 7)
str_replace — Replace all occurrences of the search string with the replacement string
Description
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 preg_replace().
Parameters
If search and replace are
arrays, then str_replace() takes a value from each array
and uses them to 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.
-
search -
The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.
-
replace -
The replacement value that replaces found
searchvalues. An array may be used to designate multiple replacements. -
subject -
The string or array being searched and replaced on, otherwise known as the haystack.
If
subjectis an array, then the search and replace is performed with every entry ofsubject, and the return value is an array as well. -
count -
If passed, this will be set to the number of replacements performed.
Examples
Example #1 Basic str_replace() examples
<?php
// Provides: <body text='black'>
$bodytag = str_replace("%body%", "black", "<body text='%body%'>");
// 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);
echo $count;
?>
Example #2 Examples of potential str_replace() gotchas
<?php
// 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);
// 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);
echo $output;
?>
Notes
Note: This function is binary-safe.
Replacement order gotcha
Because str_replace() replaces left to right, it might replace a previously inserted value when doing multiple replacements. See also the examples in this document.
Note:
This function is case-sensitive. Use str_ireplace() for case-insensitive replace.
See Also
- str_ireplace() - Case-insensitive version of str_replace
- substr_replace() - Replace text within a portion of a string
- preg_replace() - Perform a regular expression search and replace
- strtr() - Translate characters or replace substrings
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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