php - Mistake in echo -

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could tell me fails in following line: 

echo '<div id="login"><div id="centrar_app"><label>success. created account. <a href='login_app.php'>log in</a></label></div></div>';

i know must tiny stupid error, don't it.

thank time

you mixing single quotes , double quotes. href='login_app.php' change href="login_app.php"

try this, 

  echo '<div id="login"><div id="centrar_app"><label>success. created account. <a href="login_app.php">log in</a></label></div></div>';

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