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PHP syntax - El Forum - 04-22-2010
[eluser]Iwasignited[/eluser]
Hello everyone.
I know this problem is not Codeigniter related but this forum is my first PHP programming forum (I dont know any other) so I decided to post it here, please help me.
I see some people write this
Code:
&$varAnd also
Code:
===Code:
!==Looking forward to hearing from you soon.
Thanks so much.
Sorry for my English
PHP syntax - El Forum - 04-22-2010
[eluser]danmontgomery[/eluser]
http://www.whypad.com/posts/php-what-is-the-ampersand-preceding-variables/193/
http://php.net/manual/en/language.operators.comparison.php
PHP syntax - El Forum - 04-22-2010
[eluser]WanWizard[/eluser]
Using an & means you're referring to the variable by reference: http://php.net/manual/en/language.references.php
=== means you not only want to compare the value, but also the type: http://www.php.net/manual/en/language.operators.comparison.php
!== means the same, but in a 'not' context.
So:
Code:
'1' === 1; // this is FALSE
1 === 1; // this is TRUE
'1' !== 1 // this is TRUE
1 !== 1 // this is FALSECompare with:
Code:
'1' == 1; // this is TRUE
1 == 1; // this is TRUE
'1' != 1 // this is FALSE
1 != 1 // this is FALSEPHP syntax - El Forum - 04-23-2010
[eluser]Tominator[/eluser]
I show you example with &:
Code:
$a = 1;
function without($input)
{
return $input + 5;
}
function with(&$input)
{
return $input + 5;
}
echo without($a); // 6
echo $a; // 1
echo with($a); // 6
echo $a; // 6