PHP program issues: summary and explanation of array examples_PHP tutorial

I suddenly encountered a problem with php today and found this article. It is a very old article, but it is very practical. In the next article, I will organize the updated php5 array

There are more than 30 new array-related functions in PHP4.0. Many of these general functions allow you to check whether a specific object exists in a given array, count array elements, add or remove elements, or sort elements.

If you have a large array and all you want to accomplish is to find the presence of a given value, you can use in_array() to return true or false. The following code will output "Not found in this array" - because you will be looking for an "Alber" in $namesArray that does not exist.

以下为引用的内容：
$namesArray = array("Joe", "Jane", "Bob", "Mary", "Paul", "Eddie", "John");
$lookingFor = "Albert";
if (in_array($lookingFor, $namesArray)) {
echo "You've found it!";
} else {
echo "Not found in this array!";
}
?>

If you change the value of $lookingFor to "Mary", you will get the message "You've found it!" - because "Mary" is part of $namesArray.
If you want to count array elements, you can use the count() function:

The following is the quoted content:

以下为引用的内容：
$namesArray = array("Joe", "Jane", "Bob", "Mary", "Paul", "Eddie", "John");
$count = count($namesArray); ?>
$count值将为7。

$namesArray = array("Joe", "Jane", "Bob", "Mary", "Paul", "Eddie", "John");

$count = count($namesArray); ?>
The $count value will be 7.

You can add elements to any array, either at the beginning or end of an existing array. You can also use functions to create a new array containing two or more array elements. When merged each array will be in the desired order. If your array already has internal sorting, you will need to reorder the new merged array.

以下为引用的内容：
/* 创建原始数组 */
$fruitArray = array("apple", "orange", "banana", "kiwi", "pear");
/* 加入到原始数组中 */
array_push($fruitArray, "grape", "pineapple", "tomato");
/* 通过其键值列出每个元素*/
while (list($key,$value) = each($fruitArray)) {
echo "$key : $value
";
}
?>

Let’s start by adding elements to the end of an existing array, using the function array_push():

The following is the quoted content:/* Create original array*/

以下为引用的内容：
0 : apple
1 : orange
2 : banana
3 : kiwi
4 : pear
5 : grape
6 : pineapple
7 : tomato

$fruitArray = array("apple", "orange", "banana", "kiwi", "pear");<🎜>/* Add to original array*/<🎜>array_push ($fruitArray, "grape", "pineapple", "tomato");<🎜>/* List each element by its key value*/<🎜>while (list($key,$value) = each($ fruitArray)) {<🎜>echo "$key : $value
";}?>

This will display:

The following is the quoted content: 0 : apple1 : orange2: banana3: kiwi4: pear5: grape6: pineapple7: tomato

When you need to add elements to the beginning of the array, the code is very similar. The only difference is the function name: array_unshift() instead of array_push().

以下为引用的内容：
/* 创建原始数组 */
$fruitArray = array("apple", "orange", "banana", "kiwi", "pear");
/* 加入到原始数组中 */
array_unshift($fruitArray, "grape", "pineapple", "tomato");
/* 通过其键值列出每个元素*/
while (list($key,$value) = each($fruitArray)) {
echo "$key : $value
";
}
?>

This will display:

以下为引用的内容：
0 : grape
1 : pineapple
2 : tomato
3 : apple
4 : orange
5 : banana
6 : kiwi
7 : pear

Function array_merge() merges two or more arrays.

以下为引用的内容：
/* 创建原始数组 */
$fruitArray = array("apple", "orange", "banana", "kiwi", "pear");
$vegArray = array("carrot", "green beans", "asparagus", "artichoke", "corn");
/* 合并为一个数组 */
$goodfoodArray = array_merge($fruitArray, $vegArray);
/* 通过其键值列出每个元素*/
while (list($key,$value) = each($goodfoodArray)) {
echo "$key : $value
";
}
?>

This will display:

以下为引用的内容：
0 : apple
1 : orange
2 : banana
3 : kiwi
4 : pear
5 : carrot
6 : green beans
7 : asparagus
8 : artichoke
9 : corn

Now that you have added elements and merged arrays, let’s practice the element deletion function. You can use the function array_pop() to remove an element from the end of an array. If the function array_shift() is used, an element is deleted from the beginning of an array. In fact, when you delete an element from an array, the element is still available to you - when you pop or shift an element from an existing array.

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