LGitHub-sprout

<?php 
/**
 * Variable Scope Example #1:  
 * 
 * $temp = preceding text.
 * notice DECLARED var name $temp and var passed into somedate() don't have to match
 * but RETURNED var name and passed var must match
 **/

	$temp = "Ex. #1: The date is "; // set outside function

LGitHub-sprout

/**
 * Static variables keep their value after function calls.
 * useful for making counters to track number of function calls.
 * bc $count has already been declared, initialization is skipped.
 * it retains previous value, then is incremented and is displayed w new value.
 *
 * can only be assigned w predetermined value.
 * cannot assign the result of an expression.
 */
function test() {

LGitHub-sprout

/**
 * Loads of useful info here: https://www.php.net/reserved.variables.server
 *
 * Double check: always sanitize superglobals before using.
 *
 * ex. $came_from = htmlentitles( $_SERVER[ 'HTTP_REFERER' ] );
 * ex. echo "My username is " . $_ENV[ 'USER' ];
 *
 * lists all server keys and values
 */

LGitHub-sprout

function bank_balance( $checking_balance ) {

	$savings_balance = 100;

	if ( $checking_balance < 100 ) {
		$money = 1000;
		$checking_balance += $money;

	} else {
		

LGitHub-sprout

/**
 * Control structures: switch
 *
 * O'Reilly book: useful when on $var or result of expression can have multiple values.
 *
 * intersting examples in user notes 
 * https://www.php.net/manual/en/control-structures.switch.php
 */

// $foo = "is not set";

LGitHub-sprout

/**
 * O'Reilly p.82 Expressions and Control Flow
 * evaluates expression and
 * executes two stmts: one when expression is T and one when F
 * 
 * 1st stmt:  when expression is true
 * 2nd stmt:  when expression if false
 */
 $fuel = 1.00000000000001;
echo $fuel <= 1 ? "<p>Better stop for gas</p>" : "<p>Keep driving</p>";

LGitHub-sprout

<?php
/**
 * O'Reilly p.87
 * while vs. for loop:
 * use while when condition DOES NOT depend on a simple, regular change to a var.
 * use while: when checking for SPECIAL INPUT OR ERROR and end loop when it occurs.
 */
$count2 = 0;
while ( $count2++ <= 12) {
echo "<p>$count2 times 12 is " . $count2 * 12 . "</p>";

LGitHub-sprout

//Add detailed debug settings
define( 'WP_DEBUG', true ); //Turn on the debug engine
define( 'WP_DISABLE_FATAL_ERROR_HANDLER', true );   // Deactivate new WSOD protection
define( 'WP_DEBUG_LOG', true );  // error_log() will write to wp-content/debug.log
define( 'WP_DEBUG_DISPLAY', false );  // Write notices/warnings/errors to debug.log instead of the html
define( 'SCRIPT_DEBUG', true ); // Force WP to use dev/unminified versions of core CSS/JS
@ini_set( 'display_errors', 0 ); //Do not print error messages to screen.

LGitHub-sprout

<?php
/**
 * Display HTML classes for elements
 *
 * @since 0.1
 *
 * @package wphierarchy
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly. 

LGitHub-sprout

<?php
/**
 * Adds HTML markup.
 *
 * @package wphierarchy
 *
 * @since 0.1
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.