JS Lab 3

INFO-1208 (PHP)/Notes/week_6_in_class.php

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+<?php
+
+/* String Concatenation. */
+
+// Using the dot (.) operator
+$string1 = 'Hello';
+$string2 = 'World';
+$concatenation = $string1 . $string2;
+echo $concatenation;
+echo '<br><br>';
+
+// Using the concatenation assignment operator (.=)
+$string1 = 'Hello';
+$string2 = 'World';
+$string1 .= ' ' . $string2;
+echo $string1;
+echo '<br><br>';
+
+// Using double quotes (") to directly concatenate variables within a string
+$string1 = 'Hello';
+$string2 = 'World';
+$concatenation = "$string1 $string2";
+echo $concatenation;
+echo '<br><br>';
+
+/* Newlines */
+
+// Using the "\n" escape sequence
+echo "Line 1\nLine 2\nLine 3";
+echo '<br><br>';
+
+// Using double quotes (")
+echo "Line 1
+Line 2
+Line 3";
+echo '<br><br>';
+
+// Using PHP_EOL constant, which represents the correct end-of-line character
+echo "Line 1" . PHP_EOL . "Line 2" . PHP_EOL . "Line 3";
+echo '<br><br>';
+
+// Using the nl2br() function to insert HTML line breaks (\n) before all newlines in a string
+$text = "Line 1\nLine 2\nLine 3";
+echo nl2br($text);
+echo '<br><br>';
+
+/* Handling HTML String Input */
+
+// htmlspecialchars()
+$string = "<a href='test'>Test & 'Example'</a>";
+$safe_string = htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
+echo $safe_string;
+echo '<br><br>';
+
+// htmlentities()
+$string = "<a href='test'>Test & 'Example'</a>";
+$safe_string = htmlentities($string, ENT_QUOTES, 'UTF-8');
+echo $safe_string;
+echo '<br><br>';
+
+/* Encoding and Decoding */
+
+// Encode
+$url = urlencode("https://fanshawec.ca?programs=iwd&cpa");
+echo $url;
+echo '<br><br>';
+
+// Decode
+$url = urldecode("https%3A%2F%2Ffanshawec.ca%3Fprograms%3Diwd%26cpa");
+echo $url;
+echo '<br><br>';
+
+/* Adjusting strings */
+
+// substr()
+$string = "You are a wizard, Harry.";
+$substr = substr($string, 9, 6);
+echo $substr;
+echo '<br><br>';
+
+// strtok()
+$string = "Luke, I am your father.";
+$substr = strtok($string, ",");
+echo $substr;
+echo '<br><br>';
+
+// strlen()
+$string = "May the odds be ever in your favour.";
+$length = strlen($string);
+echo $length;
+echo '<br><br>';
+
+// Uppercase / Lowercase
+$string = "hello world";
+echo ucfirst($string);
+echo '<br><br>';
+echo ucwords($string);
+echo '<br><br>';
+echo strtoupper($string);
+echo '<br><br>';
+echo strtolower('HELLO WORLD');
+echo '<br><br>';
+
+/* Replacing Strings */
+
+// str_replace()
+$search = 'world';
+$replace = 'everyone';
+$subject = 'Hello world!';
+echo str_replace($search, $replace, $subject);
+echo '<br><br>';
+
+// str_ireplace()
+$search = 'WORLD';
+$replace = 'everyone';
+$subject = 'Hello world!';
+echo str_ireplace($search, $replace, $subject);
+echo '<br><br>';
+
+// trim()
+$string = "   hello world   ";
+echo trim($string);
+echo '<br><br>';
+
+// rtrim()
+$string = "hello world!!!";
+echo rtrim($string, '!');
+echo '<br><br>';
+
+$string = "    hello world";
+echo ltrim($string);
+echo '<br><br>';
+