PHP_Bibel reading and learning (1) reading books and reading classics, writing text and writing code-tough

PHP_Bibel reading and learning (1) -- reading books and reading classics, writing text and writing code-Ren also quickly looks at it, and then there are new and interesting reading every day.

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Article 1 use PHP

I. Getting started

In five minutes, click two.

1
 "; 15 $ B = & $ a; 16 echo $ B; echo"
"; 17 $ B = 3333; 18 echo $ a; echo"
"; 19 20 // execution operator 21 // ''22 $ out = 'ls-LA'; 23 echo'
'.$out.'
';

II. data storage and retrieval (direct file operations

All you want to talk about is in the code.

1 namespace Bible \ Basic \ DataUsing; 2 // Determine whether the file exists -- open the file -- lock the file -- read the file -- write data -- Unlock -- close the file 3 then filename='test.txt '; 4 if (! File_exists ($ filename) {5 echo 'The file you want to visit is not exist! '; Echo"
"; 6 exit; 7} 8 $ fp = @ fopen ($ filename, 'R + '); 9 flock ($ fp, LOCK_EX); // lock the file, only one write 10 while (! Feof ($ fp) {// read file content by row 11 $ content = fgets ($ fp); 12 echo $ content; echo"
"; 13} 14 $ writeContent = 'I have something to write in'; 15 fwrite ($ fp, $ writeContent, strlen ($ writeContent); // control the write length, compatibility consideration 16 flock ($ fp, LOCK_UN); // release lock 17 fclose ($ fp );

3. array

Other things are commonplace. you may find out what you want to use. this is just a matter of proficiency, but you still have to know.

Then I learned the advantages of usort (user-defined sorting:

1 // Chapter3.Array 2 namespace Bible \ Basic \ ArrayUsort; 3 // multi-dimensional array sorting 4 $ array1 = array (54654,545,668); 5 $ array2 = array (5454,88, 37,54 ); 6 $ array3 = array (123,4444, 5453); 7 $ arrayAll = array ($ array1, $ array2, $ array3); 8 var_dump ($ arrayAll ); 9 10 function dimensionsCompare ($ x, $ y) 11 {12 if ($ x [1] = $ y [1]) {13 return 0; 14} elseif ($ x [1] <$ y [1]) {15 return-1; 16} else {17 return 1; 18} 19} 20 @ usort ($ arrayAll, "dimensionsCompare"); 21 var_dump ($ arrayAll );

Other explode is a little fun.

IV. string operations and regular expressions

String sorting

1 $name=trim($_POST['name']);2 $email=rtrim($_POST['email']);3 $feedback=chop($_POST['feedback']);