用多个源替换字符串中的多个值

Question

I have a pixel like:

<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=[ID_MTG]&data=[TEL]' height='1' width='1' border='0'/>

I need to replace the keys [TEL] and [ID_MTG] with the value I receive from a script. For example if I have:

$tel = "0613321223";
$id_mtg = "4875";
$email = "[e-mail]";

I need to output:

<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=4875&data=0613321223' height='1' width='1' border='0'/>

If I have:

<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=[ID_MTG]&data=[EMAIL]' height='1' width='1' border='0'/>

I need to ouput:

<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=4875&data=[e-mail]' height='1' width='1' border='0'/>

I have:

$tel = "0613357221";
$email = "[e-mail]";
$id_mtg = "560";

$string = "<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=[TEL]&data=[ID_MTG]' height='1' width='1' border='0'/>";
$patterns = array();
$patterns[0] = ' /\[TEL\]/ ';
$patterns[1] = ' /\[EMAIL\]/ ';
$patterns[2] = ' /\[ID_MTG\]/ ';
$replacements = array();
$replacements[2] = $id_mtg;
$replacements[1] = $email;
$replacements[0] = $tel;
echo htmlentities(preg_replace($patterns, $replacements, $string));

But my string is:

<img src='http://www.montag.com/directory_folder/tracking_noip.php?tracking=520&data=0613357221' height='1' width='1' border='0'/>

The order is reversed.

Answer 1

The order is wrong because you defined your $replacements in reverse order. Even though you specified indexes in descending order, the order in which you created the array is preserved. Check this with print_r($replacements);. You could sort by keys with ksort() if needed to get the array in the proper order.

But for this application, strtr() or str_replace() makes more sense. Make sure to define the arrays in the same order:

$search  = array('[TEL]', '[EMAIL]', '[ID_MTG]');
$replace = array($tel, $email, $id_mtg);

$result = str_replace($search, $replace, $string);