<code> <code class="language-php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"></span>php </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">class</span> <span style="color:#00f;font-weight:bold">Student</span> </span></span><span style="display:flex;"><span>{ </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">public</span> <span style="color:#19177c">$name</span>; </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">public</span> <span style="color:#008000;font-weight:bold">function</span> __construct(<span style="color:#19177c">$name</span>) </span></span><span style="display:flex;"><span> { </span></span><span style="display:flex;"><span> <span style="color:#19177c">$this</span><span style="color:#666">-></span><span style="color:#7d9029">name</span> <span style="color:#666">=</span> <span style="color:#19177c">$name</span>; </span></span><span style="display:flex;"><span> } </span></span><span style="display:flex;"><span>}<span style="color:#008000;font-weight:bold">class</span> <span style="color:#00f;font-weight:bold">Identity</span> <span style="color:#008000;font-weight:bold">extends</span> Student </span></span><span style="display:flex;"><span>{ </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">public</span> <span style="color:#19177c">$identity_id</span>; </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">public</span> <span style="color:#008000;font-weight:bold">function</span> __construct(<span style="color:#19177c">$name</span>, <span style="color:#19177c">$identity_id</span>) </span></span><span style="display:flex;"><span> { </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">parent</span><span style="color:#666">::</span><span style="color:#7d9029">__construct</span>(<span style="color:#19177c">$name</span>); </span></span><span style="display:flex;"><span> <span style="color:#19177c">$this</span><span style="color:#666">-></span><span style="color:#7d9029">identity_id</span> <span style="color:#666">=</span> <span style="color:#19177c">$identity_id</span>; </span></span><span style="display:flex;"><span> } </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">function</span> <span style="color:#00f">show_detail</span>() { </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">echo</span> <span style="color:#19177c">$this</span><span style="color:#666">-></span><span style="color:#7d9029">name</span><span style="color:#666">.</span><span style="color:#ba2121">" : "</span>; </span></span><span style="display:flex;"><span> <span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"Your Id Number is "</span><span style="color:#666">.</span><span style="color:#19177c">$this</span><span style="color:#666">-></span><span style="color:#7d9029">identity_id</span><span style="color:#666">.</span><span style="color:#ba2121">"</span><span style="color:#b62;font-weight:bold"></span><span style="color:#ba2121">"</span>; </span></span><span style="display:flex;"><span> } </span></span><span style="display:flex;"><span>} </span></span><span style="display:flex;"><span><span style="color:#19177c">$obj</span> <span style="color:#666">=</span> <span style="color:#008000;font-weight:bold">new</span> Identity(<span style="color:#ba2121">'Alice'</span>, <span style="color:#ba2121">'1036398'</span>); </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#19177c">$obj</span><span style="color:#666">-></span><span style="color:#7d9029">show_detail</span>(); </span></span><span style="display:flex;"><span><span style="color:#bc7a00">?></span><span > </span></span></span></code></code>
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