Echo

<?php

$variable = 'ok';

/* Não imprime a variável e é necessário o escape */
echo '
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
';

echo PHP_EOL.PHP_EOL.PHP_EOL;

/* Imprime a variável e é necessário o escape */
echo "
This uses the \"here document\" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
";

echo PHP_EOL.PHP_EOL.PHP_EOL;

/* Imprime a variável e não é necessário o escape */
echo <<<STACKOVERFLOW
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
STACKOVERFLOW;