How to determine if arrays are identical in php

PHP is a programming language widely used in server-side web development, in which arrays are one of the frequently used data types. Sometimes, we need to determine whether two arrays are exactly the same so that we can perform subsequent operations. This article will introduce how to determine that arrays are identical in PHP.

1. Use the "==" operator

You can use the "==" operator in PHP to determine whether two arrays are equal, as shown below:

$array1 = array(1,2,3);
$array2 = array(1,2,3);

if($array1 == $array2){
    echo "两个数组相等！";
}else{
    echo "两个数组不相等！";
}

In the above code, $array1 and $array2 are both the same array, so the "==" operator is used for judgment, and the output result is "The two arrays are equal!".

2. Use the "===" operator

In PHP, the "===" operator can not only determine whether values ​​are equal, but also whether types are equal. Therefore, if you want to determine whether two arrays are exactly the same, you can use the "===" operator, as shown below:

$array1 = array(1,2,3);
$array2 = array(1,2,3);

if($array1 === $array2){
    echo "两个数组完全相同！";
}else{
    echo "两个数组不完全相同！";
}

In the above code, $array1 and $array2 are both the same array, and the type They are also the same, so use the "===" operator to make a judgment, and the output result is "the two arrays are exactly the same!"

3. Use the array_diff() function

PHP provides an array_diff() function, which is used to compare the differences between two arrays and return all items that exist in $array1 but are not in For elements that do not exist in $array2, we can use this function to determine whether the two arrays are exactly the same, as shown below:

$array1 = array(1,2,3);
$array2 = array(1,2,3);

$result = array_diff($array1, $array2);

if(empty($result)){
    echo "两个数组完全相同！";
}else{
    echo "两个数组不完全相同！";
}

In the above code, $array1 and $array2 are both the same arrays. By using The array_diff() function compares the difference between two arrays. If the returned result is empty, it means that the two arrays are exactly the same, and the output result is "The two arrays are exactly the same!".

4. Use the array_diff_assoc() function

Similar to the array_diff() function, PHP also provides an array_diff_assoc() function, which is used to compare the keys and values ​​of two arrays and Return the difference item. We can use this function to determine whether two arrays are exactly the same, as shown below:

$array1 = array("name"=>"Tom", "age"=>18);
$array2 = array("name"=>"Tom", "age"=>18);

$result = array_diff_assoc($array1, $array2);

if(empty($result)){
    echo "两个数组完全相同！";
}else{
    echo "两个数组不完全相同！";
}

In the above code, $array1 and $array2 are both the same arrays, and the two arrays are compared by using the array_diff_assoc() function The keys and values ​​of , if the returned result is empty, it means that the two arrays are exactly the same, and the output result is "The two arrays are exactly the same!".

Summary: The above is the exact same method for judging arrays in PHP. We can choose different methods according to the actual situation. It should be noted that when using the "==" operator to judge arrays, even if the key-value pairs of the arrays are the same but in different orders, they will be considered different arrays. Therefore, you need to pay attention to the order when using the "==" operator.

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