PHP next() Function
In this chapter you will learn:
- Definition for PHP next() Function
- Syntax for PHP next() Function
- PHP next() Function
- Note for PHP next() Functions
- Related methods
- Example - Holes in Arrays
- Example - Output the value of the current and the next element in the array
- Example - A demonstration of all related methods
Definition
The next() function moves the internal pointer to, and outputs, the next element in the array.
Syntax
PHP next() Function has the following syntax.
next(array)Parameter
| Parameter | Is Required | Description |
|---|---|---|
| array | Required. | Specifies the array to use |
Note
The next() and prev() functions
move the cursor pointer forward or backward one element respectively, returning
the value of the element now pointed to.
If cannot return a value, it will return false.
Related methods
- prev() - moves the pointer to, and outputs, the previous element in the array
- current() - returns the value of the current element in an array
- end() - moves the pointer to, and outputs, the last element in the array
- reset() - moves the pointer to the first element of the array
- each() - returns the current element key and value, and moves the pointer forward
Example 1
Using prev() and next() is more difficult when using arrays that have holes.
For example:
<?PHP/*from j a v a 2 s . com*/
$array["a"] = "Foo";
$array["b"] = "";
$array["c"] = "Baz";
$array["d"] = "Wom";
print end($array);
while($val = prev($array)) {
print $val;
}
?>
The empty value at key b causes both prev() and
next() to return false, prematurely ending the loop.
The code above generates the following result.
Example 2
Output the value of the current and the next element in the array:
<?php// j a va 2 s . c o m
$people = array("A", "B", "C", "D");
echo current($people) . "\n";
echo next($people);
?>
The code above generates the following result.
Example 3
A demonstration of all related methods:
<?php//from j ava 2s . c o m
$people = array("A", "B", "C", "D");
echo current($people) . "\n"; // The current element is A
echo next($people) . "\n"; // The next element of A is B
echo current($people) . "\n"; // Now the current element is B
echo prev($people) . "\n"; // The previous element of B is A
echo end($people) . "\n"; // The last element is D
echo prev($people) . "\n"; // The previous element of D is C
echo current($people) . "\n"; // Now the current element is C
echo reset($people) . "\n"; // Moves the internal pointer to the first element of the array, which is A
echo next($people) . "\n"; // The next element of A is B
print_r (each($people)); // Returns the key and value of the current element (now B), and moves the internal pointer forward
?>
The code above generates the following result.
Next chapter...
What you will learn in the next chapter:
- Definition for PHP pos() Function
- Syntax for PHP pos() Function
- Parameter for PHP pos() Function
- Note for PHP pos() Function
- Related methods for PHP pos() Function
- Example - Output the value of the current element in an array
- Example - A demonstration of all related methods
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