PHP

PHP means Hyper text Pre-processor.
Open source scripting language.
Executed on server.

Hyper text:
Link that links to other information.
Helps user for quickly finding the relevant information.

Pre-Processor:
Produces a output and that output is used as input for another program.

Downloading and installing PHP:

Variable:
Starts with sign of $.
No need of declaring data type like other language.
Case sensitive.
Example: $x=5;

Data types:
Supports string, float, boolean, int, array, object, null, resource.

Hello world program:

Loops:
Used to perform the same task repeatedly.

For loop:
Syntax: for(init; condition; inc/dec){
//Statement
}
Example:

While loop:
Syntax: while(condition){
//Statement
}
Example:

Do-While loop:
Syntax: do{
//Statement
}while(condition)
Example:

Conditional execution:
Checks the condition.

If:
Syntax: if(Condition){
//Statement
}
Example:

If-else:
Syntax: if(Condition){
//Statement
}
else{
//Statement
}
Example:

Switch:
Syntax: Switch(no):{
Case 1 : Statement; break;
Case 2 : Statement; break;
. . .......
Default : Statement; break;
}
Example:

Functions and calling functions:
A piece of code that takes input and produces output.

Starting index of string:

Sub-string:

Replacing a string:

User input:

File creating and writing:

File reading:

Mathematical functions:
Abs(): Returns the absolute value.
Ceil(): Returns a no up to nearest no.
Pow(): Returns the power of a no.
Sqrt(): Returns the square root of a no.
Tan(): Returns the tanget of a no.

Graphics: