note 92635 added to control-structures.switch
| From: | Ukuser at osu1 dot php dot net | Date: | Sat, 01 Aug 2009 14:48:08 +0000 |
| Subject: | note 92635 added to control-structures.switch | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-158986@lists.php.net to get a copy of this message | ||
Again, just to re-iterate, if you supply 0 as the switched element, only the first statement will
run if the comparison is with text.
$in = array('first',0,"second");
foreach ($in as $a){
switch ($a){
case "first": print "first<br>"; break;
case "second": print "second<br>"; break;
}
}
This is annoying if you're using an array where you've got key's which could be text
or numbers, so I'm using the suggested idea of:
switch (true){
case ($a==="first"): print "first<br>"; break;
case ($a==="second"): print "second<br>"; break;
}
The reason for this as mentioned on http://uk3.php.net/ternary is that: "If you compare an
integer with a string, the string is converted to a number. If you compare two numerical strings,
they are compared as integers. These rules also apply to the switch statement." Effectively
it's saying if ($a=="first") which becomes does ($a (0) == 0) which is yes.
In my example this mean't a date had a regular expression of an email applied to it which didnt
help!
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Manual Page -- http://www.php.net/manual/en/control-structures.switch.php
Edit -- https://master.php.net/note/edit/92635
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