PHP feof () function speculation _ PHP Tutorial

Source: Internet
Author: User
The prediction of the feof () function in PHP. In the official manual of 10.8.45.3.15PHP, the feof () function has a lot of discussions and some tests have been conducted .?! DOCTYPEhtmlhtmlheadmetahttp-equivContent-Typecontenttex
10.8.45.3.15

In the official PHP manual, the feof () function has a lot of discussions and related tests have been conducted.

 
                
          Test the feof () function in PHP.                   

Bool2str (= "TRUE"} "FALSE" = './7bytesfile' = (, 'R '(! ("File opening failed" (= 0; <= (); ++ (, "file location ".().":
\ N "" fseek is executed. before the read operation is executed, feof result: ". bool2str (())."
\ N "current position character :".()."
\ N "" after the file is read, feof result: ". bool2str (())."

\ N "" ftell () result :".()." \ N "(, 4" file location ".().":
\ N "" fseek is executed. before the read operation is executed, feof result: ". bool2str (())."
\ N "current position character :".()."
\ N "" after the file is read, feof result: ". bool2str (())." \ N "(, 7" file location ".().":
\ N "" fseek is executed. before the read operation is executed, feof result: ". bool2str (())."
\ N "current position character :".()."
\ N "" after the file is read, feof result: ". bool2str (())." \ N "(= (, 'R '(! ("File opening failed "(! (= 'False'} (<

?>

In PHP, the feof () implementation method does not directly check the position of the file pointer relative to the file, but returns the result based on a certain identifier. This identifier is set to "False" after each fseek () operation. the identifier is set only after a file content read operation is executed.

Based on this assumption, two types of code logic can be used.

One method is to directly check the execution results of reading functions (such as fgetc () and fgets () without checking feof.

  (( = (      }

This solution utilizes the PHP-criticized function return method, so you must use "=" or "! = "For detection, the code cannot be simplified:

 ( = ()) {}

Another method is to read the file one time before entering the feof () loop:

  = (  (!(           = ( }

After testing, it seems that the previous method is more efficient.

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