PHP Example
It is very easy to create a simple PHP example. To do so, create a
file and write HTML tags + PHP code and save this file with .php extension.
All PHP code goes between php tag. A syntax of PHP tag is given
below:
1.
<?php
2.
//your code here
3.
?>
Let's see a simple PHP example where we are writing some text
using PHP echo command.
File:
first.php
1.
<!DOCTYPE>
2.
<html>
3.
<body>
4.
<?php
5.
echo "<h2>Hello First PHP</h2>";
6.
?>
7.
</body>
8.
</html>
Output:
Hello First PHP
PHP Echo
PHP echo is a language construct not a function, so you don't need
to use parenthesis with it. But if you want to use more than one parameters, it
is required to use parenthesis.
The syntax of PHP echo is given below:
1.
void echo ( string $arg1 [, string $... ] )
PHP echo statement can be used to print string, multi line
strings, escaping characters, variable, array etc.
PHP echo:
printing string
File: echo1.php
1.
<?php
2.
echo "Hello by PHP echo";
3.
?>
Output:
Hello by PHP echo
PHP echo: printing multi line string
File: echo2.php
1.
<?php
2.
echo "Hello by PHP echo
3.
this is multi line
4.
text printed by
5.
PHP echo statement
6.
";
7.
?>
Output:
Hello by PHP echo this is multi line text printed by PHP echo
statement
PHP echo:
printing escaping characters
File: echo3.php
1.
<?php
2.
echo "Hello escape \"sequence\" characters";
3.
?>
Output:
Hello escape "sequence" characters
PHP echo:
printing variable value
File: echo4.php
1.
<?php
2.
$msg="Hello Jsk Suresh PHP";
3.
echo "Message is: $msg";
4.
?>
Output:
Message is: Hello Jsk Suresh PHP
PHP Print
Like PHP echo, PHP print is a language construct, so you don't
need to use parenthesis with the argument list. Unlike echo, it always returns
1.
The syntax of PHP print is given below:
1.
int print(string $arg)
PHP print statement can be used to print string, multi line strings,
escaping characters, variable, array etc.
PHP print:
printing string
File: print1.php
1.
<?php
2.
print "Hello by PHP print ";
3.
print ("Hello by PHP print()");
4.
?>
Output:
Hello by PHP print Hello by PHP print()
PHP print: printing multi line string
File: print2.php
1.
<?php
2.
print "Hello by PHP print
3.
this is multi line
4.
text printed by
5.
PHP print statement
6.
";
7.
?>
Output:
Hello by PHP print this is multi line text printed by PHP print
statement
PHP print:
printing escaping characters
File: print3.php
1.
<?php
2.
print "Hello escape \"sequence\" characters by PHP print";
3.
?>
Output:
Hello escape "sequence" characters by PHP print
PHP print:
printing variable value
File: print4.php
1.
<?php
2.
$msg="Hello print() in PHP";
3.
print "Message is: $msg";
4.
?>
Output:
PHP Variables
A variable in PHP is a name of memory location that holds data. A
variable is a temporary storage that is used to store data temporarily.
In PHP, a variable is declared using $ sign followed by variable
name.
Syntax of declaring a variable in PHP is given below:
1.
$variablename=value;
PHP Variable:
Declaring string, integer and float
Let's see the example to store string, integer and float values in
PHP variables.
File: variable1.php
1.
<?php
2.
$str="hello string";
3.
$x=200;
4.
$y=44.6;
5.
echo "string is: $str <br/>";
6.
echo "integer is: $x <br/>";
7.
echo "float is: $y <br/>";
8.
?>
Output:
string is: hello string
integer is: 200
float is: 44.6
PHP Variable: Sum of two variables
File: variable2.php
1.
<?php
2.
$x=5;
3.
$y=6;
4.
$z=$x+$y;
5.
echo $z;
6.
?>
Output:
11
PHP
Variable: case sensitive
In PHP, variable names are case sensitive. So variable name
"color" is different from Color, COLOR, COLor etc.
File: variable3.php
1.
<?php
2.
$color="red";
3.
echo "My car is " . $color . "<br>";
4.
echo "My house is " . $COLOR . "<br>";
5.
echo "My boat is " . $coLOR . "<br>";
6.
?>
Output:
My car is red
Notice: Undefined variable: COLOR in C:\wamp\www\variable.php on line 4
My house is
Notice: Undefined variable: coLOR in C:\wamp\www\variable.php on line 5
My boat is
PHP
Variable: Rules
PHP variables must start with letter or underscore only.
PHP variable can't be start with numbers and special symbols.
File:
variablevalid.php
1.
<?php
2.
$a="hello";//letter (valid)
3.
$_b="hello";//underscore (valid)
4.
5.
echo "$a <br/> $_b";
6.
?>
Output:
hello
hello
File:
variableinvalid.php
1.
<?php
2.
$4c="hello";//number (invalid)
3.
$*d="hello";//special symbol (invalid)
4.
5.
echo "$4c <br/> $*d";
6.
?>
Output:
Parse error: syntax error, unexpected '4' (T_LNUMBER), expecting variable (T_VARIABLE)
or '$' in C:\wamp\www\variableinvalid.php on line 2
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