Question

In: Computer Science

Can you provide with examples of these PHP common functions - echo, print, filter_input, isset, empty,...

Can you provide with examples of these PHP common functions - echo, print, filter_input, isset, empty, is_numeric, include, include_once, header, htmlspecialchars, nl2br, strops(), explode(), implode(), count()

Expert Solution

echo(), print()

<!DOCTYPE html>
<html>
<body>

<?php

echo "echo example";
echo "Hello world! ";

print "print Example ";
print "Hello world! ";
?>

</body>
</html>

Output:

echo example
Hello world!

print example
Hello world!

filter_input()

if (!filter_input(INPUT_GET, "email", FILTER_VALIDATE_EMAIL) === false) {
echo("Email is valid");
} else {
echo("Email is not valid");
}

INPUT_GET - Filter Type
"email" - Variable name to be filtered.
FILTER_VALIDATE_EMAIL - Filter type

RETURNS - false on failure and value of the variable on success, NULL if the variable is not set.

isset() , empty()

<?php
$var1 = 0;
// True because $var1 is set
if (isset($var1)) {
echo "Variable 'var1' is set. ";
}
// True because $var1 is empty
if (empty($var1 )) {
echo "Variable 'var1 ' is empty. ";
}

$var2 = null;
// False because $var2 is NULL
if (isset($var2)) {
echo "Variable 'var2' is set.";
}
?>

is_numeric()

<?php
$a = 32;
echo "a is " . is_numeric($a) . " ";

// RETURNS TRUE if variable is a number or a numeric string, FALSE otherwise

// Output : a is 1

?>

include , include_once

include 'filename';

Including of one php file into another we use include

include_once 'filename';

Including of one php file into another we use include_once but if the file is already included it will not include again.

header()

The header() function sends a raw HTTP header to a client.

<?php
header("Cache-Control: no-cache");
header("Pragma: no-cache");
?>

htmlspecialchars()

Convert the predefined characters "<" (less than) and ">" (greater than) to HTML entities:

<?php
$str = "This is some bold text.";
echo htmlspecialchars($str);
?>

// output : This is some bold text.

nl2br()

Insert line breaks where newlines (\n) occur in the string:

<?php
echo nl2br("One line.\nAnother line.");
?>

Output

One line.
Another line.

strops()

Find the position of the first occurrence of "php" inside the string:

<?php
echo strpos("I love php, I love php too!","php");
?>

Output : 7

explode()

Break a string into an array:

<?php
$str = ""Hello world. It's a beautiful day.";
print_r (explode(" ",$str));
?>

Output: Array ( [0] => Hello [1] => world. [2] => It's [3] => a [4] => beautiful [5] => day. )

implode()
Join array elements with a string:

<?php
$arr = array('Hello','World!','Beautiful','Day!');
echo implode(" ",$arr);
?>

Output : Hello World! Beautiful Day!

count()
Return the number of elements in an array:

<?php
$cars=array("car1","car2","car3");
echo count($cars);
?>

Output: 3

venereology answered 1 year ago

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