PHP user defined function

I will show you how to use user defined functions in PHP.

user defined functions are used mostly to decrease the coding load.

Besides the built-in PHP functions, we can create our own functions.

A function is a block of statements that can be used repeatedly in a program.

A function will not execute immediately when a page loads.

A function will be executed by a call to the function.

A user defined function declaration starts with the word “function”:

we create a function named “premal()”. The opening curly brace ( { ) indicates the beginning of the function code and the closing curly brace ( } ) indicates the end of the function. The function outputs “premal katigar!”. To call the function, just write its name:


We have done user defined functions.

Loops in PHP

FOR Loop:

A FOR loop continues to process a block of code until a statement becomes false, and everything is defined in a single line, making it somewhat different to a WHILE loop. Read about FOR Loops

WHILE Loops:

Basically what a WHILE loop does is evaluate a statement as true or false. If it is true it executes some code and then alters the original statement and starts all over again by re-evaluating it. It continues to loop through the code like this until the statement becomes false

Examples :

for loop


while loop



Learning conditional statements in PHP

Conditionals allow your program to make choices. Following the same sort of boolean logic you just learned about, the computer can only make two choices; true or false. In the case of PHP this is accomplished using IF : ELSE statements. Below is an example of an IF statement that would apply a senior’s discount.

in following statements if $name is premal then all statements inside breckets should be display.





echo “Premal Katigar”;




echo “Wrong Statement”;



Changing the capitalization of stings

Making the string all capital letters:

You can simulate the CAPSLOCK key using thestrtoupper() PHP function.

Making the string all lower case letters:

You can also force all letters in a string to be lower case. This is done with the strtolower() PHP function.

Capitalizing each word:

You can choose to only capitalize the first letter of every word. This works great when working with a list of names or cities. This is done with theucwords() PHP function.

Code :


// using strtoupper() we can easily get all characters in capital.

echo strtoupper(“This is Premal Katigar”);


// using strtoupper() we can easily get all characters in capital.

echo strtolower(“This is Premal Katigar”);

// using ucwords() we can easily get all words with first character capitalized


capitalize all words

Output Of above code :

capitalized character output


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