Command Line argument in PHP
=============================
Till Now we know that we can take input using
scanner Method implemented by us
No of ways taking input.
1. using Scanner class/Method
2. Command Line Argument
Command Line Argument are the compile time inputs
Generally there are two types of input
1. runtime input :
Example : Input is given after programs starts running
java p1
Enter your name : input supplying...
2. compile time input
javac p1.java 2 2
In Python
runtime input
py p1.py
Enter a Number : 2
Enter a Second No : 2
4
Compile Time :
py p1.py 2 2
4
Runtime input
php p1.php
Enter a name : awnish
awnish
compiletime Input
php p1.php awnish
awnish
write a program to implement command line argument
PHP Has inbuilt varible set : SUPER GLOBAL VARIBLE
for example $_POST,$_GET,$_REQUEST....$_FILES
$argv : it is super global varible which is used
to accept the argument varible from the compile
time input or (command line argument)
1.
print_r($argv);
1.#wap a program in php to find sum and average using command-line argument and size of
2.#wap a program in php to find sum and average using command-line argument without sizeof
offset Error in $argv
------------------------
java Index Out of Bound Error is same as Offset Error in php
if you try to get the value of such index or key which
donot exist in array of php it will lead to offset Error
for Example
php p1.php 10 20 30
total size : 4
0 - p1.php
1 - 10
2 -20
3 -30
if we try to get the value of index greater 3
$argv[4]
$argv[5]
$argv[6]
$argv[7]
$argv[8]...
Notice or Warning Error Undefined Offset Error
min and Maximum of $argv
-------------------------
$argv is special array because in normal array min = 0th Index
1th Index Min
because file name is at index 0
$min = $argv[1];
$max = $argv[sizeof($argv)-1];
Calculating the Size of any array
1.sizeof()
2.count()
what is difference B/w size of and count
1. count : static Array Runtime
2. sizeof : Dynamic Array Compile Time
<?php
#wap in php to show use of sizeof and count
print_r(count($argv));
echo "\n";
print_r(sizeof($argv));
Algorithm for calculating the size of Array.
Suppose : $a = [10,20,30,40];
$a[0] = 10 $a[$i]=10 where $i=0;
$a[1] =20 $a[$i]=20 where $i=0+1;
$a[2] =30 $a[$i]=30 where $i=1+1;
$a[3] =40 $a[$i]=40 where $i=2+1;
$a[4] = '' or false $a[$i]='' where $i=3+1; in general $i=$i+1;
$a[5] = ''
$a[6] = ''
$a[7] = ''
$a[8] = ''
$i=0;
while(true){
if($a[$i]==''){
break;
}
$i=$i+1;
}
echo $i;
Properties of $argv
1. compile time input
2. its datatype is array
3. these values are space seperated
4. every element has unique index and 0th index is reserved for filename it is automatically assignd by compiler/Integer
5. $argv is a dynamic array list
6. By default it support all the type of datatype int,string,etc but string
should be supplied within double qoutes only
7. it is hetrogenus array
8. $argv is a super global varible used for
accepting command line
9. no other super global varible can run other command line arguemnt
10. by default datatype of each arguments inside command line is of string
11.by default size of $argv is 1
12.Min size of input is 1
13. min index of $argv is 0
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