I want to remove parentheses only if they are in the beginning and the end of a given sting :
Example :
$test = array("(hello world)", "hello (world)");
becomes :
$test = array("hello world", "hello (world)");
4 Answers
Try this, using array_map() with an anonymous function, and preg_replace():
$test = array("(hello world)", "hello (world)");
$test = array_map(function($item) {
return preg_replace('/^\((.*)\)$/', '\1', $item);
}, $test);
For example:
php > $test = array("(hello world)", "hello (world)");
php > $test = array_map(function($item) { return preg_replace('/^\((.*)\)$/', '\1', $item); }, $test);
php > var_dump($test);
array(2) {
[0]=>
string(11) "hello world"
[1]=>
string(13) "hello (world)"
}
php >
As @revo pointed out in the comments, we can also modify the array in place to increase performance and reduce memory usage:
array_walk($test, function(&$value) {
$value = preg_replace('/^\((.*)\)$/', '$1', $value);
});
5 Comments
revo
FYI Instead of doing a
array_map() and storing modified cloned array to the same variable $test, you may use a array_walk() with a pass-by-reference argument.
Will
I can't think of a good way to modify it in place without having the keys as well. We'd have to use
array_walk() as theres no good way to pass the keys by reference.revo
I didn't get you thoroughly, but you don't need to pass keys at all.
Will
Ahh, hmm, do you mean
array_map(function($item) use (&$test) { $item = preg_replace(...); }, $test);?revo
What's its purpose?! That doesn't seem right to me. I just offered
array_walk over array_map in your case: array_walk($test, function(&$value) { $value = preg_replace('#^\((.*)\)$#', '$1', $value); });You can use preg_replace with array_map:
$test = array("(hello world)", "hello (world)");
$finalArr = array_map(function($value) {
return preg_replace("/^\((.*)\)$/", "$1", $value);
}, $test);
print_r($finalArr);
Result:
Array
(
[0] => hello world
[1] => hello (world)
)
Remember: It will leave out, (hello world or hello world)
1 Comment
Klaus Byskov Pedersen
@Rizier123 No. Read the question again.
You could use regex:
For example
<?php
$test = array("(hello world)", "hello (world)");
foreach ($test as &$val) {
if (preg_match("/^\(.*\)$/",$val)) {
$val = substr($val,1,-1);
}
}
print_r($test);
Prints:
Array ( [0] => hello world [1] => hello (world) )
Comments
<?php
// if first character = "(" AND last character = ")"
if (substr($string, 0,1) == "(" && substr($string, 0,-1) == ")")
{
$string = substr($string, 1);
$string = substr($string, 0,-1);
}
((hello) world), or mismatched(hello) world)))hello() world()etc