How to use ternary expressions to optimize efficiency when merging PHP arrays?

Using ternary expressions can effectively improve the efficiency of PHP array merging. The specific steps are as follows: Use the ternary expression conditional operator: $result = $condition ? $true_value : $false_value; use the array merging operation as the true value when the condition is true; use the empty array as the false value when the condition is false; Optimize the merge operation through conditional judgment, and only perform the merge when the condition is true (the array is not empty).

How to use ternary expressions to optimize the efficiency of PHP array merging

Question

How to merge arrays in PHP The built-in function array_merge() may be less efficient when merging larger arrays. When multiple arrays need to be combined into a new array, using ternary expressions can significantly improve efficiency.

Ternary expression

Ternary expression is a conditional operator, which has three operands:

$result = $condition ? $true_value : $false_value;

Among them:

• $condition is the condition to be evaluated.
• $true_value is the value when the condition is true.
• $false_value is the value when the condition is false.

Practical case

The following is a practical case of using ternary expressions to optimize the efficiency of array merging:

<?php

$array1 = ['apple', 'banana', 'cherry'];
$array2 = ['dog', 'cat', 'fish'];
$array3 = ['house', 'car', 'boat'];

// 使用三元表达式优化后的合并
$merged_array = $array1 ? array_merge($array1, $array2, $array3) : [];

// 使用传统的 array_merge() 合并
$traditional_merged_array = array_merge($array1, $array2, $array3);

echo '<pre class="brush:php;toolbar:false">';
print_r($merged_array);
print_r($traditional_merged_array);
echo '

'; ?>

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
    [3] => dog
    [4] => cat
    [5] => fish
    [6] => house
    [7] => car
    [8] => boat
)
Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
    [3] => dog
    [4] => cat
    [5] => fish
    [6] => house
    [7] => car
    [8] => boat
)

Like you As you can see, the optimized $merged_array using the ternary expression is exactly the same as the $traditional_merged_array using the traditional array_merge(). However, using a ternary expression is more efficient because it only performs the merge operation if $array1 is non-empty.

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