How to check if a variable is a numeric value?

Question

PHP PDO's lastInsertId() method actually returns an numeric value, but it may also return something completely different like some strange SQLSTATE code or whatever. In any case it returns not a numeric value I would like to log an error. Is there a way to safely check for that?

Really?! You posted 4 questions in the last hour.

Alix Axel
– Alix Axel

2009-12-28 15:05:01 +00:00
Commented Dec 28, 2009 at 15:05 — Alix Axel
– Alix Axel, Commented Dec 28, 2009 at 15:05

Matijs · Accepted Answer · 2009-12-28 13:30:26Z

8

Use

is_int($value)

or

is_numeric($value)

answered Dec 28, 2009 at 13:30

Matijs

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Gumbo · Accepted Answer · 2009-12-28 13:30:15Z

6

is_numeric returns true for numerical strings and false otherwise. A similar function is ctype_digit.

answered Dec 28, 2009 at 13:30

Gumbo

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Comments

hsz · Accepted Answer · 2009-12-28 13:41:10Z

0

is_int or is_numeric is a good way.

You can also try to cast result to (int) and check if it is > 0.

answered Dec 28, 2009 at 13:41

hsz

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