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36 lines
868 B
Markdown
36 lines
868 B
Markdown
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In the tradition of our ancestors, let's start with a hello world program.
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All PHP files must start with a `<?php` tag unless it is for a html template.
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(We will learn about html templates later.)
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```php
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<?php
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echo "Hello World!\n";
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```
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There is a lot going on in the above code so let's work through it.
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First, the echo keyword tells PHP to output some text.
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```php
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echo "I am some text\n";
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```
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Second, PHP stores text in strings.
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To write a string, you surround letters with single or double quotes.
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Double quoted strings can hold special characters like `\n` which tells PHP to start a new line.
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```php
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"\nI am a string on a new line";
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```
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Third, all lines of code in PHP must end in a semi-colon.
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```php
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echo "No semi-colon is a no-no\n";
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```
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Using semi-colons means we can write multiple statements on one line.
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```php
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echo "Hello"; echo " World\n";
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```
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