Common PHP Functions

1. For foreach, using $ key => $ value and $ I => $ g is the same effect, not limited to key value.

<? Php

Echo "<br/> \ n ";

$ Arr = array ("one", "two", "three ");

Foreach ($ arr as $ I =>$ g ){

Echo "Key: $ I; Value: $ g <br/> \ n ";

}

?>

2. array_fill () function

Fill the array with the given value

<? Php

$ A = array_fill (5, 6, 'Banana ');

Print_r ($ );

?>

Output:

Array ([5] => banana [6] => banana [7] => banana [8] => banana [9] => banana [10] => banana)

 

3. Print the Array (PHP mode and JSON mode)

$ Data = array (

'Firstname' => 'Tom ',

'Lastname' => 'Smith ',

'Age' => 40

);

Print_r ($ data );

Echo json_encode ($ data );

Output:

Array ([firstname] => Tom [lastname] => Smith [age] => 40)

{"Firstname": "Tom", "lastname": "Smith", "age": 40}

4. print_r ($ data, true); in this way, the array can be written to www.2cto.com in the log.

$ A = array ("a", "B", "c ");
$ C = print_r ($ a, true );

$ Logfile = "t.txt ";

Error_log ("{$ c} \ r \ n", 3, $ logfile );

From Crazy Coding life of Heda Li Xin