variables in php

1<?php
2  $string = 'string';
3  $number = 1;
4?>

1<?php
2    //can also use print instead of echo and would return  but it is
3    //slower so use echo mainly
4    #variable rules
5    /*
6        - Prefix with a dollar sign $
7        - Start with a letter or an underscore only
8        - Only letters, numbers and underscores
9        - Case sensative
10    */
11
12    #DATA TYPES
13    /*
14        Strings
15        Integers 4
16        floats 4.4
17        Booleans True or Flase
18        Arrays
19        Objects
20        Null
21        Resources 
22    */
23    $output = '  Hello there Bob!!';
24    $num1 = 4;
25    $num2 =10;
26    $sum = $num1 + $num2;
27    $string1 = '  Hello';
28    $string2 = 'Bobby!!';
29    $greeting = $string1 .' '. $string2;
30    $greeting2 = "$string1 $string2";
31
32    $string3 = ' They\'re Here';
33
34    #making a constant
35
36    define('GREETING', ' Hello Everyone!!');
37
38    echo $sum;
39    echo $output;
40    echo $greeting;
41    echo $greeting2;
42    echo $string3;
43    echo GREETING;
44?>

1<?php
2/* In PHP, a variable starts with the $ sign, 
3followed by the name of the variable:
4*/
5
6$txt = "Hello world!";
7$x = 5;
8$y = 10.5;
9?>

1<?php
2$txt = "Hello world!";
3$x = 5;
4$y = 10.5;
5?>

1$name = "Josh"; //$varname = value

1<?php
2  # To declare variables in php, you should prefix the variable name with
3  # a dollar sign and assign it the value. For example:
4  $msg = 'Hello World';
5  $number = 10;
6  $decimal = 98.6;
7  $result = true;
8
9  # To print out variable names, you can directly enter the variable name
10  # inside of a print or echo statement. For example:
11  echo "Variables: $msg, $number, $decimal, $result"
12?>