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New PHPBB exploit out...don't bother trying it here [message #142118]

Sat, 05 March 2005 22:12

spreegem
Messages: 1755
Registered: March 2003
Location: Ellington, CT

Karma: 0

General (1 Star)

The PHP book I got here says. . .
= means equals
== means is equal to
=== means identical to

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New PHPBB exploit out...don't bother trying it here [message #142135]

Sun, 06 March 2005 02:08

Crimson
Messages: 7427
Registered: February 2003
Location: Phoenix, AZ

Karma: 0

General (5 Stars)
ADMINISTRATOR

Laeubi

IRON FART

"==" means equal.
"===" means equal to and same type.

http://www.php.net/manual/en/language.operators.comparison.php

Right for example you can compare a number and a string like:

if ("a"==0) woudl return true, because a string is converted to zero by default if it don't conatain ana number at the start, but
if ("a"===0) would return false, because String is not Int Wink

That's not quite true, because PHP does automatic type switching in the case of "==" so the 0 integer would automatically be converted to a string of "0" and be false. Using "===" would prevent PHP from changing the integer to a string.

I'm the bawss.

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New PHPBB exploit out...don't bother trying it here [message #142151]

Sun, 06 March 2005 07:20

Rapollo
Messages: 7
Registered: January 2005
Location: United Kingdom

Karma: 0

Recruit

I am crap at php but if I am not mistaken, like spreegem said:
doesnt == represent equal to and === represent identical to, so ("a" == 0) would return false would it not? Like I said I am crap at php.

But back on topic, like j_ball:
vB owns all!

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New PHPBB exploit out...don't bother trying it here [message #142186]

Sun, 06 March 2005 09:01

snipesimo
Messages: 764
Registered: February 2003

Karma: 0

Colonel

in mIRC scripting, === is the same as == only === means case sensitive match.

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New PHPBB exploit out...don't bother trying it here [message #142268]

Sun, 06 March 2005 15:37

Deactivated
Messages: 1503
Registered: February 2003

Karma: 0

General (1 Star)

Rapollo

But back on topic, like j_ball:
vB owns all!

vB owns one's wallet.

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New PHPBB exploit out...don't bother trying it here [message #142284]

Sun, 06 March 2005 17:01

flyingfox
Messages: 1612
Registered: February 2003
Location: scotland, uk

Karma: 0

General (1 Star)

But couldn't you turn on 'option strict' (dunno what it is in php) to prevent the convertion from integer to string??

Quote:

PHP does automatic type switching in the case of "==" so the 0 integer would automatically be converted to a string of "0" and be false.

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New PHPBB exploit out...don't bother trying it here [message #142287]

Sun, 06 March 2005 17:21

Crimson
Messages: 7427
Registered: February 2003
Location: Phoenix, AZ

Karma: 0

General (5 Stars)
ADMINISTRATOR

http://us2.php.net/manual/en/language.operators.comparison.php

$a == $b Equal TRUE if $a is equal to $b.
$a === $b Identical TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)

If you compare an integer with a string, the string is converted to a number. If you compare two numerical strings, they are compared as integers.

Automatic Type Juggling

I have been coding PHP for 5 years, I know what I'm talking about.

I'm the bawss.

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New PHPBB exploit out...don't bother trying it here [message #142292]

Sun, 06 March 2005 17:38

flyingfox
Messages: 1612
Registered: February 2003
Location: scotland, uk

Karma: 0

General (1 Star)

I read & understood most of it...so in conclusion, you can juggle between data types in PHP but you can't prevent PHP from automatic juggling (converting)? All I was asking really, as in visual basic you can stop automatic conversions using option strict on to gain more control over what's happening in the code

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