Convert string to integer?

Question

I'm pulling results from an XML file and one of the values (an actual numeric ID) is being read as a string. The value is trimmed and has no whitespace. I observed this by checking with is_numeric:

        if (!is_numeric($id))
        {
            echo "<p>$id is NOT numeric";
        } else {
            echo "<p>$id is numeric";
        }

The response of a variable 643394 is:

643394 is NOT numeric

PHP has a function to convert an integer to a string (strtoint), but I didn't find a function to go the other way (inttostr).

Is it possible to convert string "1234" to integer 1234?

There must be some other characters that are part of your string because `is_numeric('643394')` should return `true`. What does `var_dump($id);` give you? — jeroen, Aug 16 '12 at 16:27
Hang on, are you trying to convert an int to a string or vice versa? — Tom, Aug 16 '12 at 16:28

score 7 · Accepted Answer · answered Aug 16 '12 at 16:26

7

Cast your string to an integer explicitly

$id = (int) $id;

ref: http://php.net/manual/en/language.types.type-juggling.php

answered Aug 16 '12 at 16:26

j08691

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May I ask what the benefit of using this advantage is over using `intval()`? – VictorKilo Aug 16 '12 at 16:29
1

@VictorKilo - According to https://wiki.phpbb.com/Best_Practices:PHP, using a function for conversion is slightly slower than directly casting. For a further explanation, see http://stackoverflow.com/questions/5339590/when-should-one-use-intval-and-when-int – j08691 Aug 16 '12 at 16:32

score 1 · Answer 2 · answered Aug 16 '12 at 16:27

1

String to integer conversion can be done with intval($id) or force an integer type with (int)$id

answered Aug 16 '12 at 16:27

Waygood

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score 0 · Answer 3 · answered Aug 16 '12 at 16:40

0

This is will help you:

$id = $id + 0;

answered Aug 16 '12 at 16:40

Daydiff

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Convert string to integer?

3 Answers3