ActionScript join/split

Question

Hi guys I have to port a few functions from AS to PHP, but I ran into a small problem.

There's an array, lets called it arr1. There is a switch, that pushes argument to this array, but after the switch ends, I'm stuck at join("").split("");

var arr1 = [];
    switch (myString)
    {
        case "apple":
        {
            arr1.push("apple");
            break;
        } 
    }
}
arr1 = arr1.join("").split("");

I know is simple, but i never had experience with arrays in flash before, I just realized join("") was used to convert the Array to string, but isn't split reversing this?

cwallenpoole · Accepted Answer · 2011-07-21 16:50:25Z

2

join(delimiter:*) will create a string from an array where each of the items from the array are separated by whatever the delimiter is (defaults to NaN, if you're interested).

split(delimiter:*, limit:Number = 0x7fffffff) beaks a string into an array of limit length based on whatever is the delimiter.

while this may look like it should output the same array consistently:

var delim:String = "someString";
arr.join(delim).split(delim)

In this case, it will actually result in a different array:

var arr:Array = ['asomeStringb','c','d']
var delim:String = "someString";
trace(arr.join(delim).split(delim))//[a,b,c,d]

If delimiter is an empty string for split, it will break the string up character by character:

var arr:Array = ['ab','c','d']
var delim:String = "";
trace(arr.join(delim).split(delim))//[a,b,c,d]

Hope that helps.

PHP equivalent might be:

$input = array( /*stuff...*/ );
// join is an alias of implode. I used it here because the AS method is join.
$input = /* explode( <-- won't work */ str_split( "", join($input));

Side note: in AS3 always type your variables as strictly as possible -- it really helps in the end. var arr1 should be var arr1:Array.

edited Jul 21, 2011 at 16:50

answered Jul 21, 2011 at 14:53

cwallenpoole

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2 Comments

Anonymous Over a year ago

Im sorry, but what should be the PHP equivalent to this?

shanethehat Over a year ago

See my comment to my answer, you can't use explode with an empty delimiter.

shanethehat · Accepted Answer · 2011-07-21 16:24:39Z

0

What this code is doing is first joining all your array values together into a string, and then splitting them into an array of the separate characters. The PHP equivalent would look something this (tested):

$arr1 = array("apple");  //arr1 after the switch
$arr1 = str_split(implode('',$arr1));

edited Jul 21, 2011 at 16:24

answered Jul 21, 2011 at 14:42

shanethehat

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2 Comments

Anonymous Over a year ago

For some reason its not correct implementation, my function errors out.

shanethehat Over a year ago

Yeah, sorry. explode() doesn't allow an empty delimiter, you have to use str_split() instead.

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