PHP 7.0.6 Released

MongoCollection::find

(PECL mongo >=0.9.0)

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() - Queries this collection, returning a single element
MongoCollection::insert() - Inserts a document into the collection
MongoDB core docs on » find.

User Contributed Notes

Nanhe Kumar

2 years ago


<?php
$m = new MongoClient();
$db = $m->selectDB('school');
$collection = new MongoCollection($db, 'student');
//Find where class=5
$where=array('class'=>5);
$cursor = $collection->find($where);

//Find where class !=5
$where=array('class' => array('$ne'=>5));
$cursor = $collection->find($where);

//Find where age >20
$where=array('age' => array('$gt'=>20));
$cursor = $collection->find($where);

//Find where age >=20
$where=array('age' => array('$gte'=>20));
$cursor = $collection->find($where);

//Find where age <20
$where=array('age' => array('$le'=>20));
$cursor = $collection->find($where);

//Find where age <=20
$where=array('age' => array('$lte'=>20));
$cursor = $collection->find($where);

//Finc where class=10 or marks=80
$where=array( '$or' => array( array(' class' =>10), array('marks'=>80) ) );
$cursor = $collection->find($where);
//Finc where class=12 AND marks=70
$where=array( '$and' => array( array(' class' =>12), array('marks'=>70) ) );
$cursor = $collection->find($where);

?>

artusdebenque at yahoo dot fr

2 years ago


For the fields parameter, the documentaion says: "The _id field is always returned".
Knowing that mongodb allows you to uncheck the _id field ("the _id field is the only field that you can explicitly exclude"; source: http://docs.mongodb.org/manual/reference/method/db.collection.find/#db.collection.find), I tried it with php and it works : you can exclude the _id field.

Example : the following fields parameter will exclude the field "_id"

$fields = array('timestamp' => true, 'rank' => true, '_id' => false);

nospam at alexyves dot fr

5 years ago


This will work with versions >=1.5.3, please note that this is just a example of the way to use the or statement.

<?php
  $connection = new Mongo();

  $db = $connection->test;
  $collection = $db->test;
  // Clean the DB before the test.
  $collection->drop();
  $collection = $db->test;

  $apple = array(
    'fruit' => 'Apple',
    'type' => 'Juice',
  );

  $orange = array(
    'fruit' => 'Orange',
    'type' => 'Marmalade',
  );

  $collection->insert($apple);
  $collection->insert($orange);

  // Basic find
  $results = $collection->find(array('fruit' => 'Apple'));

  foreach($results as $result)
  {
    echo sprintf("Fruit: %s, Type: %s%s", $result['fruit'], $result['type'], PHP_EOL);
  }
?>

Output:

Fruit: Apple, Type: Juice

Now an advanced search with "or" statement.

<?php
  // Advanced find with "OR" note the double array.
  // if you use double quotes escape the or "\$or"
  $results = $collection->find( array( '$or' => array( array('fruit' => 'Apple'), array('fruit' => 'Orange') ) ) );

  foreach($results as $result)
  {
    echo sprintf("Fruit: %s, Type: %s%s", $result['fruit'], $result['type'], PHP_EOL);
  }
?>

Output:

Fruit: Apple, Type: Juice
Fruit: Orange, Type: Marmalade

bronius dot motekaitis at gmail dot com

1 year ago


As the docs specify, '$or' conditions (and similar) get passed right on to MongoDB directly. It appears that to make a simple "field, $or, field" compound query work, all parts must be wrapped as a gigantic $and.
Here's how I got a find(), findOne(), and findAndModify() to obey such a compound $or for matching on fields, one of which is represented in data as either a string or integer:
<?php
  $query = 
    array('$and' =>
      array(
        array('assessment_id' => $doc->assessment_id),
        array('$or' =>
          array(
            array('participant_id' => $doc->participant_id),
            array('participant_id' => (string)$doc->participant_id),
          ),
        ),
        array('measure_id' => $doc->measure_id)
      ),
    );
  $thedoc = $collection->findOne($query);
  return $thedoc;
?>