Description:
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Solution: related to PHP Bugs: #32954 & #8715.


I think it's memory issue with apache handling the informix result id.
with text datatype. i don't know exactly as i am not ESQL/C developer.
but i used a combination of settings before executing the select query which have the text field in the result.

Set
ifx_blobinfile_mode(1);
ifx_textasvarchar(0);

will return the blob id, in text field value instead of the giving text contect directly into that field. 

then do
ifx_get_blob($row['text_field_name']). 
will return the file name. and then read that file content, store it in the variable. and delete the file. 

doing
ifx_free_blob($row['text_field_name']);
again crashes the php script sometimes. so don't do it. 

but you can do ifx_free_result($resultId); at the end of the script.

All The Best...

sorry, this bug means not solutions but let us consider it as a trick or tip or the way to overcome the bug.
Amit Shah