How to replace dynamic string?

Question

I have variable $menu type array like below:

$menu = array('<li class="page_item page-item-155">',
              '<li class="page_item page-item-49">',
              '<li class="page_item page-item-72">',
              '<li class="page_item page-item-18">',
              '<li class="page_item page-item-50">');

I want to replace the first original string

<li class="page_item page-item-155">'

to

<li class="current">

In the end of the string it can be any number, the numbers are not constant.

I think I need to use a regular expression but I don't know how to implement it.

$menu = str_replace($original_strs_array, $replacement_strs_array, $menu);

How can I do that? Thanks.

Have you considered using an XML parser for whatever it is you're doing? — Waleed Khan
– Waleed Khan, Commented Oct 2, 2012 at 20:02
Just replace -X" with -X current", where X is current selected menu. No need to replace class names. — Glavić
– Glavić, Commented Oct 2, 2012 at 20:04
@deizel: I am not sure that this is what eh wants. Variable $menu is array, so does he wants to replace every value? Or just the selected $menuId ? — Glavić
– Glavić, Commented Oct 2, 2012 at 20:11
@glavić I presume he has the ID, so just your str_replace in a foreach? (using $id instead of X) — deizel.
– deizel., Commented Oct 2, 2012 at 20:13

Glavić · Accepted Answer · 2012-10-02 20:31:32Z

3

Code

All $menu values: replace class="*" with class="current"

$menuA = preg_replace('~class=".+"~', 'class="current"', $menu);
print_r($menuA);

All $menu values: add className "current" to the current class

$menuB = preg_replace('~class="(.+?)"~', 'class="$1 current"', $menu);
print_r($menuB);

Selected menu: replace class="*" with class="current"

$menuC = preg_replace('~class=".*?page-item-'.$selectedMenuId.'"~', 'class="current"', $menu);
print_r($menuC);

Selected menu: add className "current" to the current class

$menuD = preg_replace('~class="(.*?)page-item-('.$selectedMenuId.')"~', 'class="$1page-item-$2 current"', $menu);
print_r($menuD);

Output

$menuA = Array
(
    [0] => <li class="current">
    [1] => <li class="current">
    [2] => <li class="current">
    [3] => <li class="current">
    [4] => <li class="current">
)
$menuB = Array
(
    [0] => <li class="page_item page-item-155 current">
    [1] => <li class="page_item page-item-49 current">
    [2] => <li class="page_item page-item-72 current">
    [3] => <li class="page_item page-item-18 current">
    [4] => <li class="page_item page-item-50 current">
)
$menuC = Array
(
    [0] => <li class="page_item page-item-155">
    [1] => <li class="page_item page-item-49">
    [2] => <li class="current">
    [3] => <li class="page_item page-item-18">
    [4] => <li class="page_item page-item-50">
)
$menuD = Array
(
    [0] => <li class="page_item page-item-155">
    [1] => <li class="page_item page-item-49">
    [2] => <li class="page_item page-item-72 current">
    [3] => <li class="page_item page-item-18">
    [4] => <li class="page_item page-item-50">
)

edited Oct 2, 2012 at 20:31

answered Oct 2, 2012 at 20:25

Glavić

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3 Comments

Glavić Over a year ago

NP. Next time be more specific in the question.

yossi Over a year ago

if $menu will be string not array and I want to replace just in the first tag li, How can I convet it to class="current" ? Thanks .

Glavić Over a year ago

Just add 1 in the 4th parameter of the preg_replace() function, no matter if $menu is string or array.

Ariyan · Accepted Answer · 2012-10-02 20:43:39Z

1

try this :

preg_replace('/page_item page-item-\d+/','current',$menu);

Or this for a generic class remover/replacer:

preg_replace("/class\s*=\s*('|\")[^'\"]*('|\")/",'class="current"',$menu);

edited Oct 2, 2012 at 20:43

answered Oct 2, 2012 at 20:05

Ariyan

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4 Comments

deizel. Over a year ago

.. or just \d+ (if you are doing a comparison with the matching number).

Ariyan Over a year ago

@deizel: he wants to replace page_item page-item- too

deizel. Over a year ago

True, but there is probably no need when the extra class can just be added. :)

Ariyan Over a year ago

@deizel: Yes he can add class by Javascript and override CSS (if its needed) and forget all these. but he asked a PHP replacement question and I answered like that! ;-)

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How to replace dynamic string?

2 Answers 2

Code

All $menu values: replace class="*" with class="current"

All $menu values: add className "current" to the current class

Selected menu: replace class="*" with class="current"

Selected menu: add className "current" to the current class

Output

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4 Comments

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Collectives™ on Stack Overflow

2 Answers 2

Code

All $menu values: replace class="*" with class="current"

All $menu values: add className "current" to the current class

Selected menu: replace class="*" with class="current"

Selected menu: add className "current" to the current class

Output

3 Comments

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