PHP Flow-Control Statements

In PHP, they are eight (8) flow-control statements. They are :-

• If Loop
• If...else Loop
• If...elseif...else Loop
• While Loop
• Do...while Loop
• Switch Statement
• For Loop
• Foreach Loop

Let me explain, each of them with a suitable examples.

Analyse the following screenshot:-

The code of the above page, is as follows:-

When we click on the "examples" of "If Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "If..Else Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "If..Elseif...Else Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "While Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "Do...While Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "Switch" Statement, the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "For Loop", the output will be :-

The code of the above page, is as follows:-

When we click on the "examples" of "Foreach Loop", the output will be :-

The code of the above page, is as follows:-

PHP Operators

Operators :-

Operators are used to perform operations on variables and values.

PHP divides the operators in the following groups:

• Arithmetic operators
• Assignment operators
• Comparison operators
• Increment/Decrement operators
• Logical operators
• String operators
• Array operators
• Bitwise operators

Let us understand all the operators with an example. Consider the following screenshot:-

This is the main page, containing the example links of all the operators in PHP. The code of the above page is as follows:-

Now, when I click on the "examples" of "Arithmetic operators", the output will be like this - 

The code for the above page is as follows:- 

When I click on the "examples" of "Assignment operators", the output will be like this - 

The code for the above page is as follows:- 

When I click on the "examples" of "Comparison operators", the output will be like this - 

The code for the above page is as follows:- 

When I click on the "examples" of "Increment/Decrement operators", the output will be like this - 

The code for the above page is as follows:- 

When I click on the "examples" of "Logical operators", the output will be like this - 

The code for the above page is as follows:-

When I click on the "examples" of "String operators", the output will be like this - 

The code for the above page is as follows:-

When I click on the "examples" of "Array operators", the output will be like this - 

The code for the above page is as follows:-

When I click on the "examples" of "Bitwise operators", the output will be like this - 

The code for the above page is as follows:-

Some Array Functions:-

1. array_diff() :- 

•  The array_diff() function compares the values of two(or more) arrays, and returns the differences.
• This function compares the values of two(or more) arrays, and return an array that contains the entire from array1 that are not present in array2 or array3 etc.
• It can be explained further with a suitable example:-

                    array_diff().php:-

                   

                     Screenshot:-

                      

    2. array_intersect() :-

• The array_intersect() function compares the values of two(or more) arrays, and returns the matches.
• This function compares the values of two or more arrays, and return an array that contains the entries from array1 that are present in array2, array3 etc.
• Now, explain it with a suitable example:-

                    array_intersect().php:-

                   

                    Screenshot:-

                     

     3.  array_push() ;-

• The array_push() function inserts one or more elements to the end of an array.
• Lets see an example:-

                    array_push().php :-

                    

                    Screenshot:-

                     

     4. array_pop() :-

• The array_pop() function deletes the last element of an array.
• Let consider an example:-

                    array_pop().php:-

                    

                     Screenshot:-

                      

     5. array_unique() ;-

• The array_unique() function removes duplicate values from an array.
• If two or more array values are the same, the first appearance will be kept and the other will be removed.
• The returned array will keep the first array item's key type.
• Consider an example:-

                     array_unique().php:-

                     

                     Screenshot:-

                     

     6. array_count():-

• The array_count() function returns the number of elements in an array.
• Consider an example:-

                    array_count().php:-

                     

                      Screenshot:-

                      

      7. array_merge() ;-

• The array_merge() function merges one or more arrays into one array.
• We can assign one array to the function, or as many as we like.
• If two or more array elements have the same key, the last one overrides the others.
• Let us consider an example:-

                    array_merge().php:-

                    

                     Screenshot:-