23 lines
884 B
Markdown
23 lines
884 B
Markdown
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title: PHP Variable Basics
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---
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Variables allow programmers to use data throuhgout a PHP script.
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In PHP, variables always start with a `$` symbol followed by the name of the variable. Only letters, numbers (may not be the first character), and underscores can make up the name of a variable.
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For example, `$my_variable`, `$anotherVariable`, and `$the2ndVariable` are allow valid variable names.
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Variable names are case-sensitive. `$my_variable` is different from `$My_Variable` which is different from `$mY_vARiAblE`.
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Before a variable can be used, it must have a value assigned to it.
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````PHP
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<?php
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$my_number = 1;
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echo($my_number);
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>>> 1
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````
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In the example above, the variable is `$my_number`. The value assigned to it was the number `1`. The variable was then passed as a parameter to the `echo` function, which output the value to the command line.
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