Need help to add second condition to existing code - php

Question

I am trying to add a second condition to existing code but it doesn't seem to be working.
The conditions are:
Compare two strings, from different arrays (working)
And check the value of a third string from a different array (not
working)
Here is the working code without the second condition: http://pastebin.com/bfpNb9zw
Here is my attempt:
Basically, the bit I am trying to get working is this part && ($ca = '') && ($ca = '0') && ($ca = '1') but it seems $ca is not able to be read outside the loop
if(!function_exists('lookup')){
function lookup($chain, $type) {
$cacount = count($chain['tbsCertificate']['extensions']);
for($j = 0; $j < $cacount; $j++) {
$count = count($chain['tbsCertificate'][$type]['rdnSequence']);
$exists = array('utf8String', 'printableString', 'teletexString', 'bmpString', 'universalString', 'ia5String');
$oid = array('id-at-commonName');
for($i = 0; $i < $count; $i++) {
foreach($exists as $field) {
if(
array_key_exists($field, $chain['tbsCertificate'][$type]['rdnSequence'][$i][0]['value']) &&
in_array($chain['tbsCertificate'][$type]['rdnSequence'][$i][0]['type'], $oid)
) {
$value = $chain['tbsCertificate'][$type]['rdnSequence'][$i][0]['value'][$field];
return $value;
$ca = '';
if(isset($chain['tbsCertificate']['extensions'][$j]['extnValue']['cA'])) {
$ca = $chain['tbsCertificate']['extensions'][$j]['extnValue']['cA'];
}
}
}
}
}
return null;
}
}
if (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca == '')) {
echo 'end entity';
}
elseif (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca == '0')) {
echo 'secondary ca';
}
elseif (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca == '1')) {
echo 'primary ca';
} else {
echo 'Root';
}

Answer 1

You are using =, which sets the value of $ca. You should be using === to check the value, instead.
Example:
if (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca === '')) {
echo 'end entity';
}
elseif (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca === '0')) {
echo 'secondary ca';
}
elseif (lookup($chain, 'subject') != lookup($chain, 'issuer') && ($ca === '1')) {
echo 'primary ca';
} else {
echo 'Root';
}