expressionEngine php parsing str_replace not working -


i have template php enabled on output. can't str_replace work. see below code. if put {title} without php works. when include php , place {title} inside str_replace function, nothing displayed. tried php simple echo 'test'; , worked. it's not parsing {title} or other field tags. 

{exp:channel:entries channel="one" url_title="{segment_2}"}   <?php     echo str_replace('old', 'new', '{title}');   ?> {/exp:channel:entries}

this may sound preposterous, have tried removing url_title parameter {exp:channel:entries} tag ensure rest of code , logic working properly?

the following code should output entry title of "old test" (without quotes):

{exp:channel:entries channel="channel_name" entry_id="xx" dynamic="off"}     {title}  {/exp:channel:entries}

given same entry title of "old test", should output: "new test" (again, without quotes):

{exp:channel:entries channel="channel_name" entry_id="xx" dynamic="off"}     <?php         echo str_replace('old', 'new', '{title}');     ?> {/exp:channel:entries}

this tested in new, blank template php enabled , set output.

screenshot


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