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PHP array

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  An array stores multiple values in one single variable. In PHP, the array() function is used to create an array. Example: <?php $pets = array ( "dog" , "cat" , "rabbit" ); echo $pets [ 0 ] . "," . $pets [ 1 ] . "," . $pets [ 2 ]; ?> Output: dog,cat,rabbit An array is a special variable, which can hold more than one value at a time. If you have a list of student names, storing the names in single variables could like this, $name1 = "Peter" $name2 = "Mickle" $name2 = "Bravo" However, what if you want to loop through the names and find a specific one? And what if you had 3 names, but 1000? The solution is to create an array . An array can hold many values under a single name, and you can access the values by referring to an index number. There are three different kind of arrays. Numeric array – Arrays with a numeric index Associative array – Arrays with named keys
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PHP switch Statement

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The switch statement is used to perform different actions based on different conditions. Syntax: <?php switch (n) { case label1 : code to be executed if n = label1; break ; case label2 : code to be executed if n = label2; break ; case label3 : code to be executed if n = label3; break ; ... default : code to be executed if n is different from all labels; } ?> Example: <?php $favsport = "cricket" ; switch ( $favsport ) { case "cricket" : echo "Your favorite sport is cricket!" ; break ; case " football" : echo "Your favorite sport is football!" ; break ; case "hocky" : echo "Your favorite sport is hocky!" ; break ; default : echo "Your favorite sport is neither cricket, football, nor hocky!" ; } ?> Output: Your favorite sport is cricket!
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PHP foreach Loop

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The PHP  foreach loop only works on arrays, and is used to loop through each key/ value pair in an array. Syntax: foreach ( $array as $value ) { code to be executed; } The following example will give the values of the given array ($fruits) from PHP foreach loop Example: <?php $fruits = array ( "Banana" , " Apple" , "Grapes" , "Mango" ); foreach ( $fruits as $value ) { echo $value . "<br />" ; } ?> Output: Banana Apple Grapes Mango The following example will output both the keys and the values of the given array ($age) Example: <?php $age = array ( "Kamal" => "22" , "Saman" => "35" , "Gamage" => "48" ); foreach ( $age as $x => $val ) { echo "$x = $val<br>" ; } ?> Output: Kamal=22 Saman=35 Gamage=48
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Simple Validation

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While you can certainly create your own fancy regular expression tests to validate common strings such as an email address, IP address or URL, it is much simpler to rely on the built-in capabilities of the filter_var() function instead. By passing the appropriate FILTER_ constant, you can easily validate a wide assortment of input values with only a single line of code. Syntax: <?php // Return 'phpcodinghelper@gmail.com', a valid email address echo filter_var ( "phpcodinghelper@gmail.com" , FILTER_VALIDATE_EMAIL ); // Return '192.168.10.10', a valid IP echo filter_var ( "192.168.10.10" , FILTER_VALIDATE_IP ); // Return 'https://phpcodinghelper.blogspot.com/', a valid URL echo filter_var ( "https://phpcodinghelper.blogspot.com/" , FILTER_VALIDATE_URL ); ?>
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