PHP array instance description. PHP4.0 contains more than 30 new array-related functions. Many common functions allow you to check for specific objects in a given array, count array elements, add or delete elements, or more than 30 new array-related functions in PHP4.0. Many common functions allow you to check for specific objects in a given array, count array elements, add or delete elements, or sort elements.
If you have a large array and all you need to do is find an existing given value, you can use in_array () to return true or false. The following code outputs "Not found in this array" -- because you will find an existing "Alber" in $ namesArray ".
$ LookingFor = "Albert ";
If (in_array ($ lookingFor, $ namesArray )){
Echo "You 've got it! ";
} Else {
Echo "Not found in this array! ";
}
?>
If You change the value of $ lookingFor to "Mary", You will get the message "You 've got it !" -- Because "Mary" is part of $ namesArray.
To count array elements, you can use the count () function:
$ Count = count ($ namesArray);?>
The $ count value is 7.
You can add elements to any array, whether at the beginning or end of an existing array. You can also use a function to create a new array containing two or more array elements. During merging, each array is arranged in the required order. If your array already has internal sorting, you need to re-sort the new merged array.
Let's start by adding elements to the end of an existing array and use the array_push () function ():
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
/* Add to the 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 show:
0: apple
1: orange
2: banana
3: kiwi
4: pear
5: grape
6: pineapple
7: tomato
When you need to add elements to the beginning of an array, the code is very similar. The difference lies in the function name: array_unshift () rather than array_push ().
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
/* Add to the original array */
Array_unshift ($ fruitArray, "grape", "pineapple", "tomato ");
/* List each element by its key value */
While (list ($ key, $ value) = each ($ fruitArray )){
Echo "$ key: $ value
";
}
?>
This will show:
0: grape
1: pineapple
2: tomato
3: apple
4: orange
5: banana
6: kiwi
7: pear
The array_merge () function combines two or more arrays.
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
$ VegArray = array ("carrot", "green beans", "asparagus", "artichoke", "corn ");
/* Merge into an array */
$ GoodfoodArray = array_merge ($ fruitArray, $ vegArray );
/* List each element by its key value */
While (list ($ key, $ value) = each ($ goodfoodArray )){
Echo "$ key: $ value
";
}
?>
This will show:
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 and merged elements to the array, you can now delete the element function. You can use the array_pop () function to delete an element from the end of an array. If array_shift () is used, an element is deleted from the beginning of the array. In fact, when you delete an element from an array, this element is still available to you-when you pop or shift an element from an existing array.
Use the array_pop () function to delete a value from the end of the array:
/* Create an array */
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
/* A value is displayed at the end */
$ Popped = array_pop ($ fruitArray );
/* List the content of the new array and the pop-up values */
While (list ($ key, $ value) = each ($ fruitArray )){
Echo "$ key: $ value
";
}
Echo"
And finally, in $ popped: $ popped ";
?>
This will show:
0: apple
1: orange
2: banana
3: kiwi
And finally, in $ popped: pear
Next, delete an element from the end of an array :???????????
Next, delete a value from the end of the array:
/* Create an array */
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
/* Remove a value from the array header */
$ Shifted = array_shift ($ fruitArray );
/* List the content of the new array and the removed value */
While (list ($ key, $ value) = each ($ fruitArray )){
Echo "$ key: $ value
";
}
Echo"
And finally, in $ shifted: $ shifted ";
?>
This will show:
0: orange
1: banana
2: kiwi
3: pear
And finally, in $ shifted: apple
There are many functions that can help you sort array elements. However, I will demonstrate basic sorting to help you understand the process:
$ FruitArray = array ("apple", "orange", "banana", "kiwi", "pear ");
/* Sort */
Sort ($ fruitArray );
/* Reset it to display the array correctly from start to end */
/* List each element by its key value */
While (list ($ key, $ value) = each ($ fruitArray )){
Echo "$ key: $ value
";
}
?>
This will show:
0: apple
1: banana
2: kiwi
3: orange
4: pear
Bytes. Many common functions allow you to check whether a specific object exists in a given array, count array elements, add or delete elements, or...
