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1. Introduction to PHP
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2. "PHP"
"Hypertext Preprocessor": executed @
server -> result @ browser
<p><?php echo date( 'Y' ); ?></p>
...generates:
<p>2019</p>
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3. Example: cart.php
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4. PHP Requirements / 1
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● HTML (w3schools.com/html)
● PHP (w3schools.com/php)
○ "syntax"
■ scripts start/end: <?php ... ?>
■ statements end with ;
■ //comment or /*comment*/ or #comment
■ variables: $var (integer, array, …)
■ echo vs return

5. PHP Requirements / 2
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● PHP (w3schools.com/php)
○ "syntax"
■ operators: == / === / >= / != / += / .
■ conditional statements: if ( ) { } else { }
■ loops: foreach ( ) { }
■ functions
■ arrays
■ forms

6. WordPress PHP
PHP functions are in functions.php
file of your current theme (plus:
other theme's PHP files - plus:
plugins' PHP - plus: custom PHP)
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