Most efficient way to search for object in an array by a specific property's value

In PHP, you can use the built-in function array_filter() to filter the array by a specific property's value. For example, if you have an array of objects and you want to find the object with a specific value for the "id" property, you can use the following code:

Example of using the built-in function array_filter() to filter the array by a specific property's value in PHP

<?php
$array_of_objects = [(object) ['id' => 1, 'name' => 'John'], (object) ['id' => 2, 'name' => 'Jane'], (object) ['id' => 3, 'name' => 'Jim'], (object) ['id' => 4, 'name' => 'Jill']];

$specific_value = 2;

$filtered_array = array_filter($array_of_objects, function ($obj) use ($specific_value) {
  return $obj->id == $specific_value;
});

print_r($filtered_array);
?>

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Output:

Array
(
    [1] => stdClass Object
        (
            [id] => 2
            [name] => Jane
        )

)

The array_filter() function filters the $array_of_objects based on the condition specified in the anonymous function. In this case, the condition checks if the id property of each object is equal to $specific_value, which is 2. Only the objects with id equal to 2 will be included in the filtered array.

Since array_filter() returns an array (preserving original keys), you can extract a single match using $result = reset($filtered_array); or array_values($filtered_array)[0] ?? null;. Always verify the result is not empty to avoid errors when the property value does not exist in the array.

Note: array_filter() iterates through the entire array. If you only need a single match, a foreach loop with an early break is faster. For repeated searches on the same dataset, consider building a lookup table (associative array) for O(1) access.