Basics of PHP
Introduction to PHP
PHP stands for Hypertext Preprocessor.It is a server-side scripting language.It is an open source software and free to download and use.
PHP files have a file extension of ".php", ".php3", or ".phtml".
PHP script:
PHP scripting block always starts with
Each code line in PHP must end with a semicolon. The semicolon is a separator and is used to distinguish one set of instructions from another.
variables :
All variables will start with $ symbol.
Simple example
$var_name = value;
condition statement:
All the condition statement syntax are same as in C language.Example if..else,switch.
Array:
Array is a homogenious collection of elements.
$arr[0]="12345";
echo $arr[0];
There are 3 types of arrays
1)Numerical arrays
2)Associative array
3)Multi dimensional arrays
Numerical arrays:
A numeric array stores each array element with a numeric index.
$type=array("cat","dog","rat");
Internally it will store as
$type[0]="cat";
$type[1]="dog";
$type[2]="rat";
Example
$type[0]="cat";
$type[1]="dog";
$type[2]="rat";
echo $type[0] . " kills " . $type[2];
?>
Associative array:
In associative array the index is replaced with a value.
$names = array("ravi"=>40, "rani"=>45, "ram"=>50);
$names['ravi']="40";
$names['rani']="45";
$names['ram']="50";
example:
$names['ravi']="40";
$names['rani']="45";
$names['ram']="50";
echo "marks of ravi,rani,ram are". $names['ravi'] .$names['rani']. $names['ram'];
?>
Loops:
All the loop statement syntax also similar as in C language.
example:
WHILE
while (condition)
{
code to be executed;
}
example:
$temp=0;
while($temp<=10)
{
echo "The number is" . $temp ;
$temp++;
}
?>
DO-WHILE
do
{
code to be executed;
}
while (condition);
example:
$temp=0;
do
{
echo "The number is" . $temp ;
$temp++;
}while($temp<=10)
?>
FOR
for (init; condition; increment)
{
code to be executed;
}
example:
for($temp=0;$temp<=10;$temp++;)
{
echo "The number is" . $temp ;
}
?>
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