PHP - check variable is neither empty nor a string

Question

I'm writing the php code which linked with database.

If I put the value on the php code for example

$pid = somevalue.

this some value will pass it to the next php file.

and I want to check this somevalue is not empty or not a string value

if( some condition ){

printf("Invalid input: %s\n", mysqli_connect_error());
echo "<br/><a href='index.php'>Back to previous page</a>";
exit();
}

N0lf · Accepted Answer · 2013-12-07 19:56:52Z

1

use

if (!empty($pid) && is_numeric($pid)) {
    // proceed
} else {
    // error
}

answered Dec 7, 2013 at 19:56

N0lf

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Comments

ishenkoyv · Accepted Answer · 2013-12-07 20:10:55Z

1

$pid  = (int) $pid;
if ($pid) {
} else {
}

answered Dec 7, 2013 at 20:10

ishenkoyv

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1 Comment

andrewsi Over a year ago

What will this do if $pid is 0?

nihylum · Accepted Answer · 2013-12-07 19:59:00Z

0

Just define it as spoken

if ( ! empty($foo) && ! is_string($foo) ) {

}

answered Dec 7, 2013 at 19:59

nihylum

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Comments

Miguel Borges · Accepted Answer · 2013-12-07 20:19:15Z

0

if(!empty($pid) and !is_string($foo)){
   printf("Invalid input: %s\n", mysqli_connect_error());
   echo "<br/><a href='index.php'>Back to previous page</a>";
   exit();
}

edited Dec 7, 2013 at 20:19

answered Dec 7, 2013 at 19:54

Miguel Borges

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1 Comment

Marcel Korpel Over a year ago

empty will also be true if a variable contains 0.

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