PHP Learning Notes-arrays (7)

Array_search (value, array, bool);

Role:

Finds the existence of an array by value, returns the key

Parameters:

Value: values that need to be looked up

Array: Arrays

Bool:false Default

True when set to True to match the type and value of values

return value:

Returns False if no Return key value is found

Example: Finding a value of 5

$arr = Array (' a ' = = 5, ' b ' = ' red ', ' c ' = ' blue '); $res 1 = array_search (' 5 ', $arr); $res 2 = Array_search (' 5 ', $arr, true); Print_r ($res 1); Print_r ($res 2); Output Result: A

Array_shift (array);

Role:

Delete the first element in an array

Parameters:

Array: Arrays

return value:

Returns the array that was deleted

Example: Deleting the first parameter of an array

$arr = Array (' 1 ', ' Red ', 3, ' Blue ', ' yellow '); $res = Array_shift ($arr); Print_r ($res); Output results: 1

Array_slice (array, start, length, bool);

Role:

Intercept array

Parameters:

array; required, arrays

Start: Required to get the starting position of the array

Length: Optional, the lengths of the array to intercept, and if negative, the beginning of the end of the array

Bool:false Default Reset Key Name

True to preserve key names

return value:

Returns the intercepted array

Example: From the beginning of the array, the array that returns the last 3rd of the array

$arr = Array (' 1 ', ' a ' = = ' red ', ' c ' = = ' yellow ', ' Blue ', ' 2 ', ' a '); $res = Array_slice ($arr, 1,-2, true); Print_r ($res); Output: Array ([a] = red [c] = yellow [1] = = blue)

Array_splice (array, start, length, array2);

Role:

removes the selected array of elements and replaces the array

Parameters:

Array: Arrays

Start: The position of the array starting at the beginning of the array if it is a negative number

Length: optional, long, if negative, the position starting at the end of the array

Array2: Optional. Specifies an array with elements to insert in the original array. If there is only one element, you can set it to a string and do not need to set an array.

return value:

Returns the array that was removed

Example: Move the first element in an array and replace the other elements

$arr 1 = Array ("A" = "red", "b" = "green"); $arr 2 = Array ("A" = "purple", "b" = "yellow"); $res = Array_splice ($arr 1, 0, 1, $arr 2); Print_r ($arr 1); Print_r ($res); Output: An array of removed arrays: Array ([0] = purple [1] = yellow [b] = = green) An array of elements removed: A Rray ([A] = red)

Array_sum (array);

Role

Computes the and of the array

Parameters:

Array: Arrays

return value:

Returns the array's and

Example:

$arr = Array (1, 2, 3, 4); $res = Array_sum ($arr); Print_r ($res); Output results: 10

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PHP Learning Notes-arrays (7)