php - Can not figure outsyntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING -

i querying database , recordid int. have line of code when echo out value of $content['recordid'] prints out numeric value, when put in here error:

syntax error, unexpected t_encapsed_and_whitespace, expecting t_string or t_variable or t_num_string.

but if replace $content['recordid'] numeric value works properly

$sqlcommentamount = "select * `info` `recordid` = $content['recordid']"; 

leave out '' within []

... $content[recordid]"; 

see documentation example #8: http://php.net/manual/en/language.types.string.php#language.types.string.parsing.simple

example #8 simple syntax example

<?php $juices = array("apple", "orange", "koolaid1" => "purple");  echo "he drank $juices[0] juice.".php_eol; echo "he drank $juices[1] juice.".php_eol; echo "he drank juice made of $juice[0]s.".php_eol; // won't work echo "he drank $juices[koolaid1] juice.".php_eol; (...) 

the above example output:

he drank apple juice. drank orange juice. drank juice made of s. drank purple juice. (...)      more complex, should use complex syntax.