Php array (1)

Php array (1) The php array index starts from 0, not 1.

$ States [0] // A normal array can use the sequence number as the key $ states ['A'] // The associated array uses a key-value pair to call $ states ['A'] [' aaa'] // This method can be used to call multiple arrays.

1. In php, no matter whether an associated array or a numeric key is used, it depends on an array pointer. the array pointer is like a bookmark, indicating the array bit being checked.

2. Instead of directly operating the array pointer, you use the built-in language features or functions to traverse the array.

3. In php, all array management methods are actually operating the array pointer, but the pointer operation methods are built in php or encapsulated by functions.

Directly create an array

$states[0] = 1;$states[] = 1;$states['aa'] = 1;

Use array () to create an array

$languages = array('spain'=>'spanish','ireland'=>'english');

Extract array with list

File users.txt content a | B | c $ users = fopen('users.txt ', 'r'); while ($ line = fgets ($ users, 4096) {list ($ name, $ sex, $ age) = explode ("|", $ line); // use explode to separate | as a separator and divide it into three parts, then, use the "list" command to separate the three variables into the three variables} echo $ name; echo $ sex; echo $ age;

Use range to generate an array

$ Test = range (); // generates an array of 6 elements ranging from 1 to 6. $ test = range (, 2); // The third parameter is the step size, the step size is probably the meaning of the interval. here 1 3 5... is generated .... Value with an interval of 2

Test array

Use is_array for testing. true and false are returned.

Print array

Print with print_r

Print_r ($ states); // Print the array through traversal