ereg_replace
Replace regular expression
Warning
This function was DEPRECATED in PHP 5.3.0, and
REMOVED in PHP 7.0.0.
Alternatives to this function include:
Description
string ereg_replace
( string $pattern
, string $replacement
, string $string
)
This function scans string for matches to
pattern, then replaces the matched text
with replacement.
Parameters
-
pattern
-
A POSIX extended regular expression.
-
replacement
-
If pattern contains parenthesized substrings,
replacement may contain substrings of the form
\digit, which will be
replaced by the text matching the digit'th parenthesized substring;
\0 will produce the entire contents of string.
Up to nine substrings may be used. Parentheses may be nested, in which
case they are counted by the opening parenthesis.
-
string
-
The input string.
Return Values
The modified string is returned. If no matches are found in
string, then it will be returned unchanged.
Examples
For example, the following code snippet prints "This was a test"
three times:
Example #1 ereg_replace example
<?php
$string = "This is a test";
echo str_replace(" is", " was", $string);
echo ereg_replace("( )is", "\\1was", $string);
echo ereg_replace("(( )is)", "\\2was", $string);
?>
One thing to take note of is that if you use an integer value as
the replacement parameter, you may not get
the results you expect. This is because
ereg_replace will interpret the number as
the ordinal value of a character, and apply that. For instance:
Example #2 ereg_replace example
<?php
/* This will not work as expected. */
$num = 4;
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has words.' */
/* This will work. */
$num = '4';
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string; /* Output: 'This string has 4 words.' */
?>
Example #3 Replace URLs with links
<?php
$text = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]",
'<a href="\\0">\\0</a>', $text);
?>
See Also
- ereg
- eregi
- eregi_replace
- str_replace
- preg_replace
- quotemeta