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In PHP, arrays are very important data structures. They not only save multiple elements, but also support various methods to process them. Array Pointer refers to the position of an element in the array when the current array is operated. When you traverse or operate in an array, the current position of the array pointer will also change. This article will introduce two commonly used functions in PHP - end() and current() , and explain how to use them to get the elements currently pointed to by the array pointer.
In PHP, an array pointer is a pointer to the current element in the array. When you perform certain operations (such as traversal, move, etc.), the array pointer points to different elements. We usually use the current() function to get the element currently pointed to by the array pointer, while the end() function moves the array pointer to the last element and returns it.
The current() function returns the element pointed to by the current pointer of the array. If you traverse the array, the position of the pointer will change. current() allows us to get the value of the element pointed to by the current pointer without affecting the movement of the pointer.
$arr = [10, 20, 30, 40];
echo current($arr); // Output：10
In the above example, current() returns the first element in the array, because when called, the array pointer points to the first element.
The end() function moves the array pointer to the last element of the array and returns the value of that element. Unlike current() , end() changes the position of the array pointer. Note that end() returns the value of the last element in the array, and the array pointer points to that element.
$arr = [10, 20, 30, 40];
echo end($arr); // Output：40
In this example, end() returns the last element in the array and points the pointer to that position.
Sometimes we may need to move the array pointer to the end and then get the element pointed to by the current pointer. At this time, you can use the end() function to move the pointer to the end, and then use current() to get the currently pointed element.
$arr = [10, 20, 30, 40];
end($arr); // Move the array pointer to the end
echo current($arr); // Output：40，The pointer currently points to the last element of the array
In this code, first call end($arr) to move the array pointer to the position of the last element, and then use current($arr) to get the currently pointed element.
The current() and end() functions can also be used in combination with other array operation functions. For example, the reset() function moves the pointer to the first element of the array, next() will move the pointer to the next element, and prev() will move the pointer to the previous element. Through these functions, you can flexibly manipulate array pointers and obtain any elements in the array.
$arr = [10, 20, 30, 40];
reset($arr); // Move the pointer to the first element
echo current($arr); // Output：10
next($arr); // Move the pointer to the next element
echo current($arr); // Output：20
Through the end() and current() functions, we can easily manipulate array pointers to get the currently pointed element. The end() function moves the array pointer to the last element and returns the element, while current() returns the element pointed to by the current pointer. Rationally using these two functions can help you operate and traverse arrays more flexibly and handle different business needs.
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