echo() is not actually a function (it is a language construct), so you are not required to use parentheses with it. echo() (unlike some other language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want to pass more than one parameter to echo(), the parameters must not be enclosed within parentheses.
echo() also has a shortcut syntax, where you can immediately follow the opening tag with an equals sign. This short syntax only works with the short_open_tag configuration setting enabled.
You can echo array values or use these values directly in your statements.
Say you have an array:
$colors=array('good ', 'very good', 'best');
The above is equivalent to:
$colors[0]="good";
$colors[1]="very good";
$colors[2]="best";
To echo, simply do:
echo $colors[0]; // outputs good
echo $colors[1]; // outputs very good
echo $colors[2]; // outputs best
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