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What are the backtick operators (``) called in the context of evaluating their content?
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Alternatively known as acute, backtick, left quote, or an open quote, the back quote or backquote is a punctuation mark (`). It's on the same U.S. computer keyboard key as the tilde.
The backtick ` is a typographical mark used mainly in computing. It is also known as backquote, grave, or grave accent. The character was designed for typewriters to add a grave accent to a (lower-case) base letter, by overtyping it atop that letter.
Backticks are an ES6 feature that allows you to create strings in JavaScript. Although backticks are mostly used for HTML or code embedding purposes, they also act similar to single and double quotes. Besides, using backticks makes it easier for string operations.
Note: we can easily use single quotes ( ' ) and double quotes ( " ) inside the backticks ( ` ). Example: To interpolate the variables or expression we can use the ${expression} notation for that.
Backticks (``) is an execution operator. PHP will attempt to execute the contents of the backticks as a shell command; the output will be returned (i.e., it won't simply be dumped to output; it can be assigned to a variable). Use of the backtick operator is identical to shell_exec().
For example,
<?php $output = `ls -la`; echo "<pre>$output</pre>"; ?> For more information, refer to Execution Operators.
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If you're referring to Bash then the backticks are known as "command substitution". $() provides similar functionality.
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