Monthly Archives: June 2012

PHP

PHP_CodeSniffer

PHP_CodeSniffer is a PHP5 script that tokenises and “sniffs” PHP, JavaScript and CSS files to detect violations of a defined coding standard. It is an essential development tool that ensures your code remains clean and consistent. It can also help prevent some common semantic errors made by developers.

A coding standard in PHP_CodeSniffer is a collection of sniff files. Each sniff file checks one part of the coding standard only. Multiple coding standards can be used within PHP_CodeSniffer so that the one installation can be used across multiple projects. The default coding standard used by PHP_CodeSniffer is the PEAR coding standard.

PHP_CodeSniffer requires PHP version 5.1.2 or greater.

it can also be used to define a set of Coding Standards  for your project.

PHP

For vs Foreach

Foreach loops are more simple and appropriate for Associative arrays and when you don’t have to keep track of iterations. For Indexed arrays, For loops are more appropriate since their incrementers are nicely associated with the keys of Indexed arrays.

PHP

While vs Do While

While is an entry control loop where do while is an exit control loop so Do While loop runs at least once even when the condition is false.

Do While executes the condition one time less than While.

General

Coding Standards

  • Indenting and Line Length
  • Control Structures
  • Function Calls
  • Class Definitions
  • Function Definitions
  • Arrays
  • Comments
  • Including Code
  • PHP Code Tags
  • Header Comment Blocks
  • Using SVN
  • Example URLs
  • Naming Conventions
  • File Formats
  • E_STRICT-compatible code
  • Error Handling Guidelines
  • Best practices
  • Sample File (including Docblock Comment standards)
  • The PEAR toolbox
  • Split function definitions onto several lines
  • Split function call on several lines
  • Split long assigments onto several lines
  • Split long if statements onto several lines
  • Ternary operators
  • Alignment of function parameters
  • Alignment of assignments
  • Array formatting
  • Recommendations
  • Notes
PHP

Foreach Loop

Foreach loop acts only on arrays and acts similar to For loop. Difference is you don’t have to define an incrementer and increment it. There is also no condition to evaluate. It would run for each item in the array and won’t run at all if the array is empty.

Syntax

foreach (array as value)  {
block of codes
}

Example

<?php
$array = array(1,2,3,4,5);
foreach($array as $value)
echo $value.” t”;
?>

Output

1 2 3 4 5

PHP

For Loop

Loops execute a block of code a specified number of times, or while a specified condition is true.

Syntax

for (initialize; condition; increment)
{
block of codes
}

Example

<?php
for($i=1;$i<=10;$i++){
echo $i.” t”;
}
?>

Output

1 2 3 4 5 6 7 8 9 10

PHP

Do While Loop

Do While loop is similar to While loop  But the difference is that its an exit control loop . That means the code in the loop will get executed at least once

Syntax

Do{
//Block of codes
}while (condition)

Example

<?php
$i=6;
do{
echo $i++.” t”;
}while($i<=5)
?>

Output

6

You can see that even though the condition is not true it will print the first value

PHP

While Loop

The while loop executes a block of code while a condition is true.

Syntax

while (condition) {
//Block of codes
}

Example

<?php
$i=1;
while($i<=10) {
echo $i++.” t”;
}
?>

Output

1 2 3 4 5 6 7 8 9 10