How to fill a value into an array with a specified length in PHP

php Xiaobian Yuzai will introduce to you how to use PHP to fill a value of a specified length into an array. In PHP, you can use the array_pad() function to achieve this functionality. This function accepts three parameters: the original array, the final array length, and the values to be filled. Through this function, you can easily fill the value of the specified length into the array to achieve the effect you want. Next, let’s take a look at the specific implementation method!

PHP uses the array_pad() function to fill the array

array_pad()function inphpis used to fill a given array to the specified length with the specified padding value. Its syntax is as follows:

array_pad(array $array, int $pad_length, mixed $pad_value, int $pad_type = STR_PAD_RIGHT) : array

parameter:

• $array:The array to be filled.
• $pad_length:The target length to be padded. If the array length is greater than this value, no padding is performed.
• $pad_value:Value added to the array to fill in the gaps.
• $pad_type(optional):Specify the padding type. The following are valid options:
  • STR_PAD_RIGHT: Pad values at the end of the array (default).
  • STR_PAD_LEFT: Fill the value at the beginning of the array.
  • STR_PAD_BOTH: Fill in values at both ends of the array.

return value:

Returns a new array containing filled elements. The original array will not be modified.

Example:

$array = ["foo", "bar", "baz"]; // Fill the array to 5 elements using the default fill type (STR_PAD_RIGHT) with the value "qux" $padded_array = array_pad($array, 5, "qux"); print_r($padded_array); // Output: ["foo", "bar", "baz", "qux", "qux"] // Use STR_PAD_LEFT to fill the array to 7 elements with the value "pre" $padded_array = array_pad($array, 7, "pre", STR_PAD_LEFT); print_r($padded_array); // Output: ["pre", "pre", "foo", "bar", "baz", "qux", "qux"] // Use STR_PAD_BOTH to fill the array to 6 elements with the value "xyz" $padded_array = array_pad($array, 6, "xyz", STR_PAD_BOTH); print_r($padded_array); // Output: ["xyz", "foo", "bar", "baz", "xyz", "xyz"]

Notice:

• If$pad_lengthis less than the length of the original array, the array will not be filled.
• If$pad_lengthis less than or equal to 0, anInvalidArgumentExceptionexception will be thrown.
• The fill value can be of any data type.

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