How to write to a file not just a string?

Question

bash

Hello. You need to write some data to the file, namely the code. I do this:
echo "code" > file
Everything is fine if there is just a string, but when I try to write php code to a file, nothing happens. I thought to transfer to base64, and then decode it, but I'm not sure that there is no more correct way.
Tell me what to do. Thanks in advance.

Answer 1

#!/bin/bash

myvar=foobuzz

cat <<EOF >> my_template

# my text
$myvar # вставить значение $myvar

EOF

echo "! Вместо переменной сейчас ее значение"
cat my_template


cat <<'EOF' >> my_copypaste

# my text
$myvar # текст

EOF

echo "! Переменная не заменена на ее значение"
cat my_copypaste

! Вместо переменной сейчас ее значение

# my text
foobuzz # вставить значение foobuzz

! Переменная не заменена на ее значение

# my text
$myvar # текст

Answer 2

just don't forget to escape some characters