MongoCollection
PHP Manual

MongoCollection::find

Queries this collection, returning a MongoCursor for the result set

Description

public MongoCursor MongoCollection::find ([ array $query = array() [, array $fields = array() ]] )

Parameters

query

The fields for which to search. MongoDB's query language is quite extensive. The PHP driver will in almost all cases pass the query straight through to the server, so reading the MongoDB core docs on » find is a good idea.

Warning

Please make sure that for all special query operators (starting with $) you use single quotes so that PHP doesn't try to replace "$exists" with the value of the variable $exists.

fields

Fields of the results to return. The array is in the format array('fieldname' => true, 'fieldname2' => true). The _id field is always returned.

Return Values

Returns a cursor for the search results.

Examples

Example #1 MongoCollection::find example

This example demonstrates basic search options.

<?php

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'produce');

// search for fruits
$fruitQuery = array('Type' => 'Fruit');

$cursor = $collection->find($fruitQuery);
foreach ($cursor as $doc) {
    var_dump($doc);
}

// search for produce that is sweet. Taste is a child of Details. 
$sweetQuery = array('Details.Taste' => 'Sweet');
echo "Sweet\n";
$cursor = $collection->find($sweetQuery);
foreach ($cursor as $doc) {
    var_dump($doc);
}

?>

The above example will output:

array(4) {
  ["_id"]=>
  object(MongoId)#7 (1) {
    ["$id"]=>
    string(24) "50a87dd084f045a19b220dd6"
  }
  ["Name"]=>
  string(5) "Apple"
  ["Type"]=>
  string(5) "Fruit"
  ["Details"]=>
  array(2) {
    ["Taste"]=>
    string(5) "Sweet"
    ["Colour"]=>
    string(3) "Red"
  }
}
array(4) {
  ["_id"]=>
  object(MongoId)#8 (1) {
    ["$id"]=>
    string(24) "50a87de084f045a19b220dd7"
  }
  ["Name"]=>
  string(5) "Lemon"
  ["Type"]=>
  string(5) "Fruit"
  ["Details"]=>
  array(2) {
    ["Taste"]=>
    string(4) "Sour"
    ["Colour"]=>
    string(5) "Green"
  }
}

Sweet:
array(4) {
  ["_id"]=>
  object(MongoId)#7 (1) {
    ["$id"]=>
    string(24) "50a87dd084f045a19b220dd6"
  }
  ["Name"]=>
  string(5) "Apple"
  ["Type"]=>
  string(5) "Fruit"
  ["Details"]=>
  array(2) {
    ["Taste"]=>
    string(5) "Sweet"
    ["Colour"]=>
    string(3) "Red"
  }
}

See MongoCursor for more information how to work with cursors.

Example #2 MongoCollection::find example

This example demonstrates how to search for a range.

<?php

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');

// search for documents where 5 < x < 20
$rangeQuery = array('x' => array( '$gt' => 5, '$lt' => 20 ));

$cursor = $collection->find($rangeQuery);
foreach ($cursor as $doc) {
    var_dump($doc);
}

?>

The above example will output:

array(2) {
  ["_id"]=>
  object(MongoId)#10 (1) {
    ["$id"]=>
    string(24) "4ebc3e3710b89f2349000000"
  }
  ["x"]=>
  int(12)
}
array(2) {
  ["_id"]=>
  object(MongoId)#11 (1) {
    ["$id"]=>
    string(24) "4ebc3e3710b89f2349000001"
  }
  ["x"]=>
  int(12)
}

See MongoCursor for more information how to work with cursors.

Example #3 MongoCollection::find example using $where

This example demonstrates how to search a collection using javascript code to reduce the resultset.

<?php

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');

$js = "function() {
    return this.name == 'Joe' || this.age == 50;
}";
$cursor = $collection->find(array('$where' => $js));
foreach ($cursor as $doc) {
    var_dump($doc);
}

?>

The above example will output:

array(3) {
  ["_id"]=>
  object(MongoId)#7 (1) {
    ["$id"]=>
    string(24) "4ebc3e3710b89f2349000002"
  }
  ["name"]=>
  string(3) "Joe"
  ["age"]=>
  int(20)
}

Example #4 MongoCollection::find example using $in

This example demonstrates how to search a collection using the $in operator.

<?php

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');

$cursor = $collection->find(array(
    'name' => array('$in' => array('Joe', 'Wendy'))
));

?>

The above example will output:

array(3) {
  ["_id"]=>
  object(MongoId)#7 (1) {
    ["$id"]=>
    string(24) "4ebc3e3710b89f2349000002"
  }
  ["name"]=>
  string(3) "Joe"
  ["age"]=>
  int(20)
}

Example #5 Getting results as an array

This returns a MongoCursor. Often, when people are starting out, they are more comfortable using an array. To turn a cursor into an array, use the iterator_to_array function.

<?php

$m = new MongoClient();
$db = $m->selectDB('test');
$collection = new MongoCollection($db, 'phpmanual');

$cursor = $collection->find();
$array = iterator_to_array($cursor);

?>

The above example will output:

array(3) {
  ["4ebc40af10b89f5149000000"]=>
  array(2) {
    ["_id"]=>
    object(MongoId)#6 (1) {
      ["$id"]=>
      string(24) "4ebc40af10b89f5149000000"
    }
    ["x"]=>
    int(12)
  }
  ["4ebc40af10b89f5149000001"]=>
  array(2) {
    ["_id"]=>
    object(MongoId)#11 (1) {
      ["$id"]=>
      string(24) "4ebc40af10b89f5149000001"
    }
    ["x"]=>
    int(12)
  }
  ["4ebc40af10b89f5149000002"]=>
  array(3) {
    ["_id"]=>
    object(MongoId)#12 (1) {
      ["$id"]=>
      string(24) "4ebc40af10b89f5149000002"
    }
    ["name"]=>
    string(3) "Joe"
    ["age"]=>
    int(20)
  }
}

Using iterator_to_array forces the driver to load all of the results into memory, so do not do this for result sets that are larger than memory!

Also, certain system collections do not have an _id field. If you are dealing with a collection that might have documents without _ids, pass FALSE as the second argument to iterator_to_array (so that it will not try to use the non-existent _id values as keys).

See Also

  • MongoCollection::findOne
  • MongoCollection::insert
  • MongoDB core docs on » find.