photoshop learning PHP learning array value operations

1. Value extraction
In PHP, list is used to extract the values ​​in the array, such as list($a, $b) = $array. If there are more values ​​in the list than the number of arrays, the excess values ​​in the list will be set to NULL. You can also use commas to skip values ​​in the array, such as list($a, ,$b) = $array.

2. Divide the array
If you want to get the sub-array, you can use array_slice(array, offset, length); to get it. It returns a new array with indexes starting from 0. If the subscript of the original array is a string, it seems to be meaningless. It is best not to use it. You can use array_splice to obtain the substring.

3. Divide the array into multiple arrays
Use array_chunk to divide the array into a two-dimensional array. For details, you can read the official instructions through the link.

4. Keys and values ​​
array_keys($array), get the array composed of array index
array_value($array), get the array composed of array value, the index is reallocated from 0.
array_key_exists($key, array), check whether the element exists.
array_splice, delete inserted elements.

5. Conversion between arrays and variables
extract(array) turns arrays into variables
compact() turns variables into arrays

The above introduces the operations of array values ​​in photoshop learning and PHP learning, including the content of photoshop learning. I hope it will be helpful to friends who are interested in PHP tutorials.