Find MongoDB data with PHP - php

Question

Mongodb search with PHP code:
$cond=array();
$cond=array_merge($cond,array("clicks" => array('$gt' =>6)));
if (isset($lang)){
$cond=array_merge($cond,array("$or" => array(array("lang" =>'de'),array("lang" =>'fr'))));
}
if (isset($country)){
$cond=array_merge($cond,array("$or" => array(array("country" =>'us'),array("country" =>'uk'))));
}
Problem: On the last line, the second $or of country is replacing the first $or of lang. Would be great if anyone can suggest how can we avoid this overriding issue?
Actually I'm new to MongoDB, I want to create a find query in MongoDB. I have to build the query on the basis of some condition flags (e.g. if '$country=true' only then embed country filter) for each column. Similar to SQL The output I need is:
"Where clicks > 6 and (lang = 'de' or lang = 'fr') and (country = 'us' or country = 'uk')"

Answer 1

This is how your resulting array should look like:
$cond = [
'$and' => [
['clicks' => [ '$gt' => 6 ]],
['$or' => [
[ 'lang' => 'de' ],
[ 'lang' => 'fr' ]
]],
['$or' => [
[ 'country' => 'us' ],
[ 'lang' => 'uk' ]
]]
]
];
Now, to achieve this by using the modular approach you have specified, you could do something like this:
$cond = [
'$and' => [
['clicks' => [ '$gt' => 6 ]]
]
];
if (isset($lang)) {
$cond['$and'][] = ['$or' => [['lang' =>'de'], ['lang' =>'fr']]];
}
if (isset($country)) {
$cond['$and'][] = ['$or' => [['country' =>'us'], ['country' =>'uk']]];
}
Hopefully this will demonstrate the way to assemble nested or/and query in PHP, so you can adjust it further as your design will demand.