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<?php $cosas = array( 'true' => TRUE, 'false' => FALSE, 'null' => NULL, 'empty' => "", 'positive' => 1, 'negative' => -1, 'zero' => 0 ); foreach($cosas as $nombre => $cosa) { echo "<h3>$nombre</h3>"; echo "<ul>"; echo "<li><strong>isset: </strong>" . ( isset($cosa) ? "TRUE" : "FALSE" ) . "</li>"; echo "<li><strong>is_null: </strong>" . ( is_null($cosa) ? "TRUE" : "FALSE" ) . "</li>"; echo "<li><strong>empty: </strong>" . ( empty($cosa) ? "TRUE" : "FALSE" ) . "</li>"; echo "</ul>"; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<h3>true</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>FALSE</li></ul><h3>false</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>TRUE</li></ul><h3>null</h3><ul><li><strong>isset: </strong>FALSE</li><li><strong>is_null: </strong>TRUE</li><li><strong>empty: </strong>TRUE</li></ul><h3>empty</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>TRUE</li></ul><h3>positive</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>FALSE</li></ul><h3>negative</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>FALSE</li></ul><h3>zero</h3><ul><li><strong>isset: </strong>TRUE</li><li><strong>is_null: </strong>FALSE</li><li><strong>empty: </strong>TRUE</li></ul>
preferences:
280.02 ms | 407 KiB | 459 Q