parsing or syntax errors sometimes produce a complete parser bailout, giving the user "Document contains no data". Usually we get "parse error at line XX" as expected but with certain types of errors, in certan combinations, we just get the whole lotta nothing. Mostly these are unmatched single quotes, brackets and parens. Following are some complete scripts that reliably cause this on our system:

#1:
<?php
echo "great " . ' googily . " moogily";
?>

=============
#2:
<?php
function foo() {
   return "hello kitty";
}
 echo foo); ?>

===========
#3:
<?php
function foo() 
   return "hello kitty";
}
 echo foo(); ?>



This might seem like a trivial thing since these are so obvious but in a large script it makes it basically impossible to track down several errors like this, especially when hairer complex expressions are used.

Here is the relevant section of php.ini:
error_reporting =       7
display_errors  =       On
log_errors        =       On
track_errors    =       On 
 
this is how PHP was configured:
   ./configure --with-mysql --with-pgsql=/usr/bin --with-apache=../apache -enable-track-vars=on

Thx!