One-dimensional array is a very basic data structure in PHP. It is composed of one or more elements, each element corresponds to a key and a value. In PHP, you can use some built-in functions to add, delete, modify and traverse one-dimensional arrays.
So, how to modify a one-dimensional array in PHP? Several commonly used methods will be introduced below.
- Use key names to modify
Each element of a one-dimensional array has a key and a value, and you can use the key name to modify the corresponding value.
Example:
$arr = array('name' => 'Tom', 'age' => 20); // 修改 name 的值 $arr['name'] = 'Jerry';
In the above example, we can see that the value corresponding to name is obtained through $arr['name']
, and then it is Assign the new value Jerry
.
- Using the array_splice() function
This function is a standard function in PHP and can be used to delete, replace or add elements in an array. If we only need to modify an element in a one-dimensional array, we can do it through array_splice()
. Specific examples are as follows:
Example:
$arr = array('a','b','c','d','e'); // 将 $arr 中第 3 个元素替换为 h array_splice($arr, 2, 1, 'h');
In the above example, the first parameter of the array_splice()
function $arr
is to The array of operations, the second parameter 2
is the position of the element to be adjusted, 1
is the number of elements to be replaced, and the last parameter is the new element to be inserted. When this function completes, the $arr
array will become array('a','b','h','d','e')
.
- Use the array_replace() function
This function is a powerful one-dimensional array modification function in PHP. Use it to easily replace values in a one-dimensional array.
Example:
$arr = array('name' => 'Tom', 'age' => 20, 'gender'=> 'male'); // 将 $arr 中 age 的值改为 30 $arr = array_replace($arr, array('age' => 30));
In the above example, the first parameter $arr
in the array_replace()
function is to be modified One-dimensional array, the second parameter is also an array, containing the key-value pairs that need to be updated. When the function completes, the $arr
array will become array('name' => 'Tom', 'age' => 30, 'gender'=> 'male') ;
.
- Use the array_map() function
This function is a basic function in PHP that can modify the value of the array according to the specified callback function. It should be noted that the array_map()
function will save the modified result in a new array, and the original array will not be modified.
Example:
$arr = array('apple', 'banana', 'orange'); // 将 $arr 中 apple 和 banana 替换为 peach 和 kiwi $new_arr = array_map(function($value) { if ($value == 'apple') { return 'peach'; } else if ($value == 'banana') { return 'kiwi'; } else { return $value; } }, $arr);
In the above example, the first parameter of the array_map()
function is a callback function used to modify the elements in the array. The second parameter is an array, that is, the original array to be modified. When the function completes, the $new_arr
array will become array('peach', 'kiwi', 'orange')
.
To sum up, the above introduces several commonly used methods of modifying one-dimensional arrays in PHP. Which method to use needs to be chosen on a case-by-case basis. In PHP, array is a very important data type, and it is very important to master its basic usage.
The above is the detailed content of How to change one-dimensional array in php. For more information, please follow other related articles on the PHP Chinese website!

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