feat: output and refactor variabled

codewithhridoy · Mar 29, 2024 · 796029d · 796029d
1 parent f5e7fdd
commit 796029d
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Showing 9 changed files with 165 additions and 22 deletions.
diff --git a/.idea/.gitignore b/.idea/.gitignore
diff --git a/.idea/modules.xml b/.idea/modules.xml
diff --git a/.idea/php-basics-to-advanced.iml b/.idea/php-basics-to-advanced.iml
diff --git a/.idea/php.xml b/.idea/php.xml
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
diff --git a/02_output.php b/02_output.php
@@ -0,0 +1,55 @@
+<?php // This is a php tag. If there is no html or other content below the php, we don't need to close the php tag.
+
+/* ------- Outputting Content ------- */
+
+// Echo - Output strings, numbers, html, etc
+echo 'Hello';
+echo '<br/>';
+
+echo 123;
+echo '<br/>';
+
+echo '<h1>Hello</h1>';
+
+// print - Similar to echo, but a bit slower
+print 'Hello';
+echo '<br/>';
+
+// print_r - Gives a bit more info. Can be used to print arrays
+print_r('Hello');
+echo '<br/>';
+
+print_r([1, 2, 3]);
+echo '<br/>';
+
+// var_dump - Even more info like data type and length
+var_dump('Hello');
+echo '<br/>';
+
+var_dump([1, 2, 3]);
+echo '<br/>';
+
+// Escaping characters with a backslash
+echo 'You can\'t do that.';
+
+$name = 'Ahmed';
+
+// If there is more content after the PHP, such as this file, you do need the ending tag. Otherwise you do not.
+?>
+
+<!-- You can output any HTML that you want within a .php file -->
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>My PHP Website</title>
+</head>
+<body>
+  <!-- You can output PHP including variables, etc -->
+  <h1>Hello <?php echo $name; ?></h1>
+  <!-- You may only drop the semi-colon after a statement when the statement is followed immediately by a closing PHP tag ?>. -->
+  <h1>Hello <?= $name ?></h1>
+</body>
+</html>
diff --git a/02_data_types.php → 03_data_types.php b/02_data_types.php → 03_data_types.php
@@ -16,12 +16,12 @@
 $integer = 1; // int(1)
 $float = 99.99; // float(99.99)
 $boolean = true; //bool(true)
-$even_numbers=[2,4,6,8]; 
-$obj = (object) ['key' => 'value'];
+$even_numbers=[2,4,6,8];
+$object = (object) ['key' => 'value'];
 $null = NULL; // NULL
-$resource = fopen("example.txt", "r");
+// $resource = fopen("example.txt", "r");
 
-var_dump($null, $string, $integer, $float, $boolean, $even_numbers, $obj, $resource);
+var_dump($null, $string, $integer, $float, $boolean, $even_numbers, $object);
 
 
 /**
@@ -40,4 +40,4 @@
   ["key"]=>
   string(5) "value"
 }
- */
+ */
diff --git a/03_variables.php b/03_variables.php
diff --git a/04_variables.php b/04_variables.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Rules for PHP variables:
+ * A variable starts with the $ sign, followed by the name of the variable
+ * A variable name must start with a letter or the underscore character
+ * A variable name cannot start with a number
+ * A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
+ * Variable names are case-sensitive ($age and $AGE are two different variables)
+ */
+
+$name = 'Ahmed'; // String // Can be single or double quotes
+$age = 28; // Integer
+$has_kids = true; // Boolean
+$number_of_kids = 1; // Boolean
+$cash_on_hand = 1_00_000.55; //Float
+
+/* --- Adding variables to strings -- */
+echo "<br />";
+// Double quotes can be used to add variables to strings
+echo "$name is $age years old";
+
+// deprecated at php8.3
+// echo "${name} is ${age} years old";
+
+// Concatenate Strings
+
+
+if($has_kids) {
+    echo '<p>He has Kids.</p>';
+}
+
+echo '<h3>' . 'He has ' . $cash_on_hand . ' BDT on hand.</h3>';
+
+// Arithmetic Operators
+
+echo 5 + 5;
+echo "<br/>";
+echo 10 - 6;
+echo "<br/>";
+echo 5 * 10;
+echo "<br/>";
+echo 10 / 2;
+echo "<br/>";
+
+// Constants - Cannot be changed
+define('HOST', 'localhost'); // Old Way
+const USER = 'root'; // Latest
+
+var_dump(HOST, USER);