What's The Importance Of (!) & (@) Before Functionname

[medicalboy]

i want to know what's the diffrence between

while(!feof($con))

and

while(feof($con))

what's the importance of (!)also

@opendir($this->newsDir

and

opendir($this->newsDir

the importance of @

Edited October 9, 2009 by medicalboy

[Synook]

! is the logical NOT operator, it make things false when they were true, and true when they were false. So !true == false, and !false == true. @ is the error suppression operator*, and any expression executed with @ preceding will not report errors. Won't stop the page crashing if the error is fatal though.* edit, officially known as the error control operator.

Edited October 9, 2009 by Synook

[medicalboy]

! is the logical NOT operator, it make things false when they were true, and true when they were false. So !true == false, and !false == true. @ is the error suppression operator, and any expression executed with @ preceding will not report errors. Won't stop the page crashing if the error is fatal though.

thanx synook for your great helpanother inquiry

$response .= fgets($con,128)

and

$response = fgets($con,128)

importance of dot (.) before =appreciated again for your help

[Synook]

. is the string concatenate operator, and the syntax

$var <operator>= value;

is equivalent to

$var = $var <operator> value;

So

$response .= fgets($con,128);

represents

$response = $response . fgets($con,128);

Edited October 9, 2009 by Synook

[justsomeguy]

You can find the complete list of PHP operators in the manual:http://www.php.net/manual/en/language.operators.php

[medicalboy]

. is the string concatenate operator, and the syntax

$var <operator>= value;

is equivalent to

$var = $var <operator> value;

So

$response .= fgets($con,128);

represents

$response = $response . fgets($con,128);

understoodgreat job

[medicalboy]

You can find the complete list of PHP operators in the manual:http://www.php.net/manual/en/language.operators.php

very helpful thanx