[SOLVED] Using && and || Operator in same line??

[GregL83]

Simple questions for the noob...I have an if statement where I want true to be returned dependent on three things.  The first must always be true and the second and third must have one of the two true...I am not sure how the operation is conducted...

if(isset($_POST['submit']) && $item = "width" or $item = "height") {
$update["$item"] = $_POST[$item]."px";
}

 

Thanks for the help.. 

[sw0o0sh]

if(isset($_POST['submit']) && $item = "width" || isset($_POST['submit']) && $item="height"){

 

$update[$item] = $_POST[$item] . "px";

 

}

[btherl]

You can use brackets to enforce the order of evaluation.  Another method is to create temporary variables to hold intermediate results, and then use those temporary variables in the "if".  Temporary variables often results in MUCH more readable code.

 

Example:

 

$submitted = isset($_POST['submit'];
$item_valid = ($item == "width" or $item == "height");
if ($submitted && $item_valid) {
}

 

Also note that you must use == or === when testing values, NEVER =.  "=" will set the variable to a new value.

[GregL83]

Thanks for the help.

[sw0o0sh]

$submitted = isset($_POST['submit']); *

 

You can also do this:

 

$submit = (isset($_POST['submit'])) ? $_POST['submit'] : NULL;

 

// If submit is set, then $submit is = $submit, else its NULL.

 

if($submit){

 

if($item == "width" OR $item == "height"){

 

# do this

 

}

 

}

[boo_lolly]

like this:

<?php
        if(isset($_POST['submit']) && ($item = "width" || $item = "height")) {
                $update['$item'] = $_POST[$item'] . 'px';
        }
?>