Common php library functions

: This article mainly introduces common php library functions. For more information about PHP tutorials, see. 1) time and date

It mainly involves time () and date ();

 '; // Echo date_default_timezone_get (); // Set the time zone date_default_timezone_set ('Asia/Shanghai'); // output data echo date ('Y-m-d H: i: s'); echo'
'; // Convert the timestamp to the date echo date ('Y-m-d H: I: S', '123 ');

2) json format data operations:

It mainly involves json_encode () and json_decode ();

 'Lily', 'age' => 23); print_r ($ arr); echo'
'; Echo json_encode ($ arr); // Convert the key-value pair object to data in json format $ obj = array ('H' => 'hello ', 'W' => 'world', array (3, 5, 7); echo'
'; Print_r ($ obj); echo'
'; Echo json_encode ($ obj); // Convert data in json format to a key-value pair object $ objJson =' {"h": "hello", "w ": "world", "0": [5, 7, 8]} '; $ myObj = json_decode ($ objJson); echo'
'; Print_r ($ myObj); echo'
'; Echo $ myObj-> w;

3) file operations:

Fopen (), fwrite (), fclose (), fgets (), file_get_contents (), and so on;

 
/*** Read data */$ rf = @ fopen ('data', 'r'); // fgets () read-only row while (! Feof ($ rf) {$ c echo $ content;} fclose ($ rf );
// Php provides a method to directly obtain all the content of the file echo file_get_contents ('data ');
4) generate images. for more methods, click the php image method.
  

5) watermark the image
   
For more details, refer to the php Chinese manual.

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The above describes common php library functions, including some content, and hope to help those who are interested in PHP tutorials.