Queries this collection, returning a MongoCursor for the result set

# MongoCollection::find

(PECL mongo >=0.9.0)

MongoCollection::find — Queries this collection, returning a MongoCursor for the result set

### Descrierea

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

### Parametri

`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.

  Avertizare

  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.

### Valorile întoarse

Returns a cursor for the search results.

### Exemple

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);
}
?>`

Exemplul de mai sus va afișa:

    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);
}
?>`

Exemplul de mai sus va afișa:

    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);
}
?>`

Exemplul de mai sus va afișa:

    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'))
));
?>`

Exemplul de mai sus va afișa:

    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);
?>`

Exemplul de mai sus va afișa:

    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).

### A se vedea și

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