I am not able to get the product id in php strlen()

Question

<?php  
  $name = "product_"
  $lens = strlen($name - 8); 
  $id = substr($name , 8 , $lens);
  $query = query("SELECT * FROM product WHERE product_id= ".escape_string($id)." ");
?>

I want to take the id of product, but when I try it I see:

A non-numeric value encountered in strlen($name - 8);

Is there another way to do it?

in the code you posted, there's no 'id', only 'product_' name — Leo Tahk, Jul 24 '18 at 23:42
I think you should consider using `$id = preg_replace("/[^0-9]/", '', $name);` — Tom, Jul 25 '18 at 00:01
.... which will also save you the 'escape_string' since you know there are only digits in the string — Tom, Jul 25 '18 at 00:13

Decent Dabbler · Accepted Answer · 2018-07-24T23:53:28.633

0

I think you mean

$lens = strlen($name) - 8;

but you don't actually need $lens, because you can just do

$id = substr( $name, 8 );

That will automatically give you the remaining characters.

Now, the reason you are getting the warning, is because of this. In other words, you are trying to subtract a number from a string:

$name - 8

edited Jul 24 '18 at 23:53

answered Jul 24 '18 at 23:47

Decent Dabbler

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I am not able to get the product id in php strlen()

1 Answers1