add element into an array

rolwong

I'd like to ask how I can add a new "key" and "value" to an array by for loop method.

for eg. user will enter his name and password. When a new loginID and password is enter, it will "push" into an array such as

myArray['peter'] = abc;
myArray['john'] = xyz123;

I only know array_push(myArray, xyz123), but this method cannot indicate the "key". How can I add a new element with both 'key' and 'value'? thanks.

leatherback

Hi,

I could be wrong.. But ehh.. have you tried the answer you gave yourself?

$input is a two dim. array, holding $heys and $values, but could of course be replaced bu anything with the $key and $value

for($i=0; $i<$numberofnew; $i++)
 {
  $key = $input['keys'][$i];
  $value = $input['values'];
  $myarray[$key] = $value;
 }

rolwong

Thanks for the quick reply. um..i am not quite understand the logic...but let me explain more about what i want to do.

Let say. i have
array1 = ['301','302','303','304'];
array2 = ['T','T','F','T'];

I want to combine these 2 arrays into one array with key and value so that:

newArray['301'] = 'T', newArray['302'] = 'T', ...etc.

I like to use a for-loop such as:

for ($i=0;$i<4;$i++) {
// how to be done?
}

leatherback

Hi,

I am not sure wether this would work, but I think this should work:

for($i=0; $i<4; $i++) 
 { 
  $key = $array1[$i]; 
  $value = $array2[$i]; 
  $newarray[$key] = $value; 
 }

If it doesn't.. Please post again, and I'll have a look at the manual

rolwong

Thanks dude, i finally got the meaning. you did help me a lot.

toplay

I was just about to post and leatherback beat me to it. I agree with leatherback's code. Well done!

FYI: If you ever have an associative array and need to switch the keys to being values, and the values being keys, then check out the PHP array_flip() function:

http://us4.php.net/manual/en/function.array-flip.php

hiroh2k

I'd like to ask how I can add a new "key"
and "value" to an array by for loop method.

It's weird, but true, just DECLARE te sentence and is all:

myArray ["my_key"] = "my_value";

and IS ALL!

I usually initialize a variable as FALSE before using it as array then i change to array with the previous sentence.

you can check if that key is used with the isset function as:

isset (myArray["myKey"])