feat: numbers

07_numbers.php

@@ -0,0 +1,101 @@
+<?php
+
+/*
+ * There are three main numeric types in PHP:
+ * Integer
+ * Float
+ * Number Strings
+ *
+ * In addition, PHP has two more data types used for numbers:
+ * Infinity
+ * NaN
+ * */
+
+
+$total_flats = 2;
+$per_flat_price = 5000.00;
+$total_price = "1e4";
+$final = 2 * $total_price; // returns float
+
+var_dump($total_flats, $per_flat_price, $total_price, $final);
+
+echo '<pre>';
+echo '===== Check integer ====';
+echo '<pre>';
+
+/*
+ * Check integer
+ * is_int()
+ * is_integer() - alias of is_int()
+ * is_long() - alias of is_int()
+ * */
+
+$x = 5985;
+var_dump(is_int($x));
+
+$y = 59.85;
+var_dump(is_int($y));
+
+
+echo '<pre>';
+echo '===== Check Float ====';
+echo '<pre>';
+
+/*
+ * Check Float
+ * is_float()
+ * is_double() - alias of is_float()
+ * */
+
+$x = 10.365;
+var_dump(is_float($x));
+
+echo '<pre>';
+echo '===== Check Numeric ====';
+echo '<pre>';
+
+
+/*
+ * Check Numeric
+ * is_numeric()
+ * */
+
+$x = 5985;
+var_dump(is_numeric($x));
+
+$x = "5985";
+var_dump(is_numeric($x));
+
+$x = "59.85" + 100;
+var_dump(is_numeric($x));
+
+$x = "Hello";
+var_dump(is_numeric($x));
+
+echo '<pre>';
+echo '===== Check Infinity ====';
+echo '<pre>';
+
+/*
+ * Check Infinity
+ * is_finite()
+ * is_infinite()
+ * */
+
+$x = 1.9e411;
+var_dump($x);
+var_dump(is_finite($x));
+var_dump(is_infinite($x));
+
+echo '<pre>';
+echo '===== Check NaN ====';
+echo '<pre>';
+
+/*
+ * Check NaN
+ * is_nan()
+ * */
+
+$x = acos(8);
+var_dump($x);
+var_dump(is_nan($x));