To be a nitpicker, the word to use is interpolated / interpolation, as in:
You can use interpolation to interpolate (insert) a variable within a string. Interpolation works in double quoted strings and the heredoc syntax.
Everything in PHP gets interpreted...
For completeness, PHP also has the complex / curly bracket syntax for embedding expressions (yielding a return value) in a string.
Any scalar variable, array element or object property with a string representation can be included.
Simply write the expression the same way as it would appear outside the string, and then wrap it in { and }.
Since { can not be escaped, this syntax will only be recognized when the
$ immediately follows the {.
<?php// Show all errorserror_reporting(E_ALL);$great='fantastic';// Won't work, outputs: This is { fantastic}echo"This is { $great}";// Works, outputs: This is fantasticecho"This is {$great}";// Worksecho"This square is {$square->width}00 centimeters broad.";// Works, quoted keys only work using the curly brace syntaxecho"This works: {$arr['key']}";// Worksecho"This works: {$arr[4][3]}";// This is wrong for the same reason as $foo[bar] is wrong outside a string.// In other words, it will still work, but only because PHP first looks for a// constant named foo; an error of level E_NOTICE (undefined constant) will be// thrown.echo"This is wrong: {$arr[foo][3]}";// Works. When using multi-dimensional arrays, always use braces around arrays// when inside of stringsecho"This works: {$arr['foo'][3]}";// Works.echo"This works: ".$arr['foo'][3];echo"This works too: {$obj->values[3]->name}";echo"This is the value of the var named $name: {${$name}}";echo"This is the value of the var named by the return value of getName(): {${getName()}}";echo"This is the value of the var named by the return value of \$object->getName(): {${$object->getName()}}";// Won't work, outputs: This is the return value of getName(): {getName()}echo"This is the return value of getName(): {getName()}";?>
To be a nitpicker, the word to use is interpolated / interpolation, as in:
You can use interpolation to interpolate (insert) a variable within a string. Interpolation works in double quoted strings and the heredoc syntax.
Everything in PHP gets interpreted...
For completeness, PHP also has the complex / curly bracket syntax for embedding expressions (yielding a return value) in a string.
Any scalar variable, array element or object property with a string representation can be included.
Simply write the expression the same way as it would appear outside the string, and then wrap it in { and }.
Since { can not be escaped, this syntax will only be recognized when the
$ immediately follows the {.
Thanks @cseder for correcting me out.
And adding some valuable examples too ✌