Recent Notes
Displaying keyword search results 1 - 10
Created by James on January 10, 2011 15:20:10
Last update: February 03, 2012 10:10:14
Dojo ShrinkSafe: http://shrinksafe.dojotoolkit.org/ : command line utility written in Java, based on Rhino - JavaScript engine written in Java.
Douglas Crockford's JSMIN: http://crockford.com/javascript/jsmin : command line utility written in C, can download MS-DOS exe.
Dean Edwards' Packer: http://dean.edwards.name/packer/ : online tool, or .NET, Perl, PHP application.
YUI Compressor: http://developer.yahoo.com/yui/compressor/ : command line utility written in Java.
Google Closure Compiler : command line Java application, web application, or RESTful API.
One problem is, the compressor utility may not be 100% reliable. So make sure to test the compressed script.
Created by jinx on May 18, 2011 20:09:05
Last update: May 18, 2011 20:09:05
The PHP function file_get_contents reads the entire contents of a file into a string, while the function file reads a file into an array.
file_get_contents('filename') is equivalent to implode('', file('filename')) :
<?php
// reads entire file into array, one elem...
Created by jinx on May 04, 2011 19:39:44
Last update: May 04, 2011 19:42:51
The function include includes the specified file multiple times, while include_once only includes the file once.
This is a test:
Create file test.php with contents:
<?php
for ($i = 0; $i < 5; $i++) {
inclu...
Create file test.inc with contents:
<?php
echo __FILE__, " included: $i\n";
?>
...
Run test.php , the output is:
E:\phpwork\test.inc included: 0
E:\phpwork\test...
Change include to include_once , only one line is printed:
E:\phpwork\test.inc included: 0
You must use include_once to avoid duplicate includes in the case A includes B and C , but B and C both includes D .
The relationship between require and require_once is the same.
Created by jinx on May 03, 2011 09:12:05
Last update: May 03, 2011 09:12:19
Both include and require include and evaluate the file specified as argument. The only difference is, when the included file cannot be found, include emits a warning while require emits a fatal error.
Example:
<?php
include('non-existing-file');
require(...
Outputs:
PHP Warning: include(non-existing-file): failed t...
Suppress error with @ :
<?php
@include('non-existing-file');
echo "A...
Outputs:
After include
Created by jinx on May 02, 2011 20:48:49
Last update: May 02, 2011 20:58:01
A PHP try catch block looks like this:
<?php
try {
throw new MyException('foo!'...
Normally, no exceptions are thrown from internal function errors. For example:
<?php
$a = 1;
$b = 0;
try {
$v = $...
The division by zero error is never caught as an exception.
However , you can translate errors into exceptions with an error handler and ErrorException :
<?php
function exception_error_handler($errno, ...
which prints:
Exception: exception 'ErrorException' with message...
PHP does not support finally clause.
Created by jinx on April 28, 2011 20:52:45
Last update: April 29, 2011 13:27:31
This is normally a syntax error just before some variable. Try some of these:
Missing operator before a variable:
<?php
$a = 'ab';
echo('Missing conca...
Missing semicolon at end of line:
<?php
echo('Missing semicolon at end of lin...
Missing ( and ) in for loop:
<?php
foreach $a as $i {
echo "$i\n";
...
Missing keyword before class variable:
<?php
class A {
// should be var $a;
...
Created by jinx on April 28, 2011 21:09:08
Last update: April 28, 2011 21:09:08
PHP global variables are defined outside of functions and classes. They are visible both in the current file and in any included/required files. Also, any global variables defined in required/included files are visible in the current file. But they are not visible in any functions or classes, unless specifically declared global .
Test:
Create file test.php :
<?php
ini_set('display_errors', 'stderr');
i...
Create file test.inc :
<?php
echo '[', __FILE__, '] $a . $b = ', $...
Run the PHP script in command line:
php test.php 2>C:\tmp\stderr.out
The result is:
[C:\work\test.inc] $a . $b = ab
[C:\work\test.p...
stderr messages:
PHP Notice: Undefined variable: b in C:\work\scra...
Created by jinx on April 25, 2011 12:57:46
Last update: April 25, 2011 12:58:08
In PHP, a heredoc string starts with <<< followed immediately by an end tag and a new line, and ends by the end tag on its own line followed by a semi-colon.
Example:
<?php
$v = "variable";
$s = <<<END_TAG
...
Created by jinx on April 20, 2011 08:59:07
Last update: April 20, 2011 08:59:30
You get this warning when timezone is not set (which is the default):
PHP Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EDT/-4.0/DST' instead in test.php on line 8
To get rid of the warning message, set timezone in php.ini :
;;;;;;;;;;;;;;;;;;;
; Module Settings ;
;;;;...
Created by jinx on April 19, 2011 20:59:13
Last update: April 19, 2011 21:00:05
To write to a file with PHP (either text or binary):
Get a file handle with fopen .
Write to the file with fwrite . fwrite writes a string to a file. But since PHP strings are simply arrays of bytes, there's really no difference between text and binary.
Close the file with fclose .
Example code:
<?php
$fname = "test.txt";
// wr...
