php - Replace string with int

Question

I have made my own array with all the letters, numbers and most of the symbols and given each one a number for exemple 'a' = 19; How do I replace the $string letters/numbers with the numbers in the array so that $newString = 19202122 for example?

$string = 'abcd'; $stringList = array( 19 => 'a', 20 => 'b', 21 => 'c', 22 => 'd', }; $newString = 19202122;

I'm really bad at php and trying to learn, I have been looking how to do it but I could not find anyting... — Michael
– Michael, Commented Nov 14, 2013 at 21:02

Videron · Accepted Answer · 2013-11-14 21:11:46Z

2

You can use the functions str_replace, array_keys and array_values. Like that:

$string = 'abcd'; $stringList = array( 19 => 'a', 20 => 'b', 21 => 'c', 22 => 'd', }; $newString = str_replace(array_values($stringList), array_keys($stringList), $string); echo $newString; // 19202122

edited Nov 14, 2013 at 21:11

answered Nov 14, 2013 at 21:02

Videron

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5 Comments

Martin Over a year ago

It would be more readable and also more efficient, if the array was not defined in the style of replacement => needle. See my comment for an example

Videron Over a year ago

@MartinCernac Well you are right but I wanted to keep the author's array, we don't know how and from where he got it.

Martin Over a year ago

Well he mentioned, that "he made his own array" so I based my answer on that. Anyway your solution is clearly easier to implement, since it's a drop-in.

Michael Over a year ago

how can I make it in a more efficient way?

Martin Over a year ago

@Michael check my answer. It is more efficient, because it doesn't have to modify the array, it just uses it as you define it.

Martin · Accepted Answer · 2013-11-14 21:09:17Z

Define the array the other way and use the strtr() function like this:

$string = 'abcd'; $stringList = array( 'a' => 19, 'b' => 20, 'c' => 21, 'd' => 22, ); $newString = strtr($string, $stringList);

AlliterativeAlice · Accepted Answer · 2013-11-14 21:01:05Z

Use str_replace with arrays:

$letters = array('a','b','c','d'); $numbers = array(19,20,21,22); $newString = str_replace($letters,$numbers,$string);

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