PHP

Running

See setup and AMP notes, need the server

Basics

<?php
  //code here
  $my_name = "JJ";
  print($my_name);
    print "Hi"
?>
<div> body </div>

  • dynamically typed language

  • All variable names begin with a $ followed by letters digits or underscores

Printing

  • echo //no return type

  • print //return true always

  • if you use (), only one argument

  • should do $s." ".$t

Functions

  • Function names are not case sensitive

  • & in function def is pass by reference

  • javascript scoping for functions not {}

  • global declaration global $x makes it Avaliable everywhere

    <?php
function increment(&$num) {
// this $num is the actual parameter below
$num++;
  print('$num in function: ' . "$num");
}
?>

Strings

<?php 
  "Passwd:$password[Joe]" #double quotes allow interpolation
  $name = 'j' . 'f' #concatination
  $str = implode("^",$ar") #join in python
  $ar = explode(":",$str); #split in python
?>

Arrays

Basically dictionaries that if not set use numeric indexes

<?php
$ar = array("key1"=>"value 1", 67=>3, "a"=>10, 4=>"Hi");
$x = array();
$my_array[2] = 2006; // this is literally declaring an array
$my_array = array("Hello",2,TRUE);

$usernames = array_keys($ar);
$passwds= array_values($ar);
?>

Functions to call on arrays

  • unset //entry or entire array

  • count OR sizeof

  • is_array

Control

  • if and then like C++, switch statement

    Loops

  • while, for

<?php
  foreach($array as $value) {}
  foreach($array as $key => $value){}
  for ($i = 0; $i < 10; $i++) {
    //
  }
?>

Big Project Functions

  • isset($x)

  • gettype($x)

Includes

include("filename")

  • check

ERRORS

Do not put a space between #!/usr/local/bin/php <?php ?>

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