regexp in switch statement
PhpSwitch StatementPhp Problem Overview
Are regex's allowed in PHP switch/case statements and how to use them ?
Php Solutions
Solution 1 - Php
Switch-case statement works like if-elseif.
As well as you can use regex for if-elseif, you can also use it in switch-case.
if (preg_match('/John.*/', $name)) {
// do stuff for people whose name is John, Johnny, ...
}
can be coded as
switch $name {
case (preg_match('/John.*/', $name) ? true : false) :
// do stuff for people whose name is John, Johnny, ...
break;
}
Hope this helps.
Solution 2 - Php
No or only limited. You could for example switch for true:
switch (true) {
case $a == 'A':
break;
case preg_match('~~', $a);
break;
}
This basically gives you an if-elseif-else statement, but with syntax and might of switch (for example fall-through.)
Solution 3 - Php
Yes, but you should use this technique to avoid issues when the switch argument evals to false:
switch ($name) {
case preg_match('/John.*/', $name) ? $name : !$name:
// do stuff
}
Solution 4 - Php
Keep in mind the above answer can be slightly optimized like this:
Changing:
switch $name {
case (preg_match('/John.*/', $name) ? true : false) :
// do stuff for people whose name is John, Johnny, ...
break;
}
To:
switch $name {
case (bool)preg_match('/John.*/', $name) :
// do stuff for people whose name is John, Johnny, ...
break;
}