Weird behavior with leading zeros

twilson

When I use the following code, and similar code, something strange happens:

<?php
    if (!empty($this->Item[$TD_Part]['TechSpec']['Manufacturer'])) {
    	echo $this->Item[$TD_Part]['TechSpec']['Manufacturer'];
    } else {
    	echo $this->Item[$TD_Part]['VEND_CODE'];
    } ?>

This is what is happening. When the variable $TD_Part starts with a 0, it ALWAYS evaluates to false (even when it should be evaluating true), but the echo in the false block WORKS!

If I use settype on $TD_Part and set it to integer, the statement evaluates to true and the echo with 3 dimensions works, but the IF statements below with a 2 dimensional echo DO NOT WORK.

How do I make all the arrays of all dimensions work? Furthermore, why does the type change which variables evaluate and which don't??

Thanks a million for the help,

Tom 🙂

mrhappiness

i don't get it. do you mean that this code:

$TD_Part = 'hello';
$x->Item[$TD_Part]['TechSpec']['Manufacturer'] = 'hello_man';
$x->Item[$TD_Part]['VEND_CODE'] = 'hello_vend';


$TD_Part = '055';
$x->Item[$TD_Part]['TechSpec']['Manufacturer'] = '045_man';
$x->Item[$TD_Part]['VEND_CODE'] = '045_vend';

settype($TD_Part, 'integer');
$x->Item[$TD_Part]['TechSpec']['Manufacturer'] = $TD_Part.'_man_int';
$x->Item[$TD_Part]['VEND_CODE'] = $TD_Part.'_vend_int';

print_r($x);

if (!empty($x->Item[$TD_Part]['TechSpec']['Manufacturer'])) {
        echo $x->Item[$TD_Part]['TechSpec']['Manufacturer'];
    } else {
        echo $x->Item[$TD_Part]['VEND_CODE'];
}

$TD_Part = '055';
if (!empty($x->Item[$TD_Part]['TechSpec']['Manufacturer'])) {
        echo $x->Item[$TD_Part]['TechSpec']['Manufacturer'];
    } else {
        echo $x->Item[$TD_Part]['VEND_CODE'];
}

$TD_Part = 'hello';
if (!empty($x->Item[$TD_Part]['TechSpec']['Manufacturer'])) {
        echo $x->Item[$TD_Part]['TechSpec']['Manufacturer'];
    } else {
        echo $x->Item[$TD_Part]['VEND_CODE'];
}

would echo
hello_man
045_vend
55_man
?

WebRuss

From the PHP Manual:
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);

Note the use of ===. Simply == would not work as expected because the position of 'a' was the 0th (first) character and 0 interprets as false!

if ($pos === false) {

}

It could be that the empty() function is interpreting a ZERO as false like the example above?

Perhaps you should be literal in your code
and use !==empty() or !=="" instead of !empty()

Regards
WebRuss