CODEWITHSUNDEEP
phpstring
ashkufaraz
ashkufaraz

Reputation: 5297

compare tow string with == and strcmp

Php code

$test='00000000000000000000000000000001';
if($test==1)
   echo 'yes1 ';
if($test=="1")
   echo 'yes2 ';
if((string)$test==1)
   echo 'yes3 ';
if((string)$test=="1")
   echo 'yes4 ';
if((string)$test=="00000000000000000000000000000001")
   echo 'yes5 ';

Online Code

why all condition are true? realy (string)$test is equal to "1"?

but when use strcmp($test,"00000000000000000000000000000001") this correct reutrn 0 and for strcmp($test,"1") return -1?

why?

Upvotes: 2

Views: 206

Answers (3)

Sony
Sony

Reputation: 1793

Doc and doc.

== compare after type juggling. === compare also the type.

Upvotes: 1

Jim
Jim

Reputation: 22656

== (and !=) doesn't compare the type only the value.

Since '00001' is a string and 1 is an int then these are converted into the same type in order to compare.

In this case '00001' is converted to an int - 1. 1 == 1 is true.

In order to exactly match on type you should use === and !==.

Upvotes: 6

Inurosen
Inurosen

Reputation: 196

Please read about php type juggling. It is explained there. http://php.net/manual/en/language.types.type-juggling.php

Also check out comparison operators. http://php.net/manual/en/language.operators.comparison.php

Upvotes: 3

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