Comment utiliser la fonction ord () dans PHP pour déterminer si un caractère est majuscule ou minuscule?

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Ce n&#39;est pas lié au contenu de l&#39;articlePHPExemple de code</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Ceci est un exemple de programme，Pour démonstrationPHPStructure de code。"</span></span><span>;
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<span class="hljs-comment">/*
 * Titre d&#39;article：PHP Comment l&#39;utiliser ord() Fonction pour déterminer si un caractère est en majuscule ou en minuscules？
 *
 * ord() La fonction renvoie le caractère ASCII valeur。
 * existerASCIIDans la table de code，lettre majuscule A-Z La portée de 65 arriver 90，
 * Lettres minuscules a-z La portée de 97 arriver 122。
 * utiliser ord() Les fonctions obtiennent des caractères ASCII code，
 * 就可以通过比较这个数valeur来判断personnageOui大写还Oui小写。
 */</span>

</span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">checkCase</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$char</span></span></span><span>) {
    </span><span><span class="hljs-variable">$ascii</span></span><span> = </span><span><span class="hljs-title function_ invoke__">ord</span></span><span>(</span><span><span class="hljs-variable">$char</span></span><span>);
    </span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-variable">$ascii</span></span><span> &gt;= </span><span><span class="hljs-number">65</span></span><span> &amp;&amp; </span><span><span class="hljs-variable">$ascii</span></span><span> &lt;= </span><span><span class="hljs-number">90</span></span><span>) {
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"lettre majuscule"</span></span><span>;
    } </span><span><span class="hljs-keyword">elseif</span></span><span> (</span><span><span class="hljs-variable">$ascii</span></span><span> &gt;= </span><span><span class="hljs-number">97</span></span><span> &amp;&amp; </span><span><span class="hljs-variable">$ascii</span></span><span> &lt;= </span><span><span class="hljs-number">122</span></span><span>) {
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"Lettres minuscules"</span></span><span>;
    } </span><span><span class="hljs-keyword">else</span></span><span> {
        </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"Pas en anglais"</span></span><span>;
    }
}

</span><span><span class="hljs-comment">// Exemple de test</span></span><span>
</span><span><span class="hljs-variable">$testChars</span></span><span> = [</span><span><span class="hljs-string">'A'</span></span><span>, </span><span><span class="hljs-string">'z'</span></span><span>, </span><span><span class="hljs-string">'M'</span></span><span>, </span><span><span class="hljs-string">'m'</span></span><span>, </span><span><span class="hljs-string">'9'</span></span><span>, </span><span><span class="hljs-string">'@'</span></span><span>];

</span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$testChars</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$c</span></span><span>) {
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"personnage '<span class="hljs-subst">{$c}</span></span></span><span>' Oui：" . </span><span><span class="hljs-title function_ invoke__">checkCase</span></span><span>(</span><span><span class="hljs-variable">$c</span></span><span>) . </span><span><span class="hljs-string">"&lt;br&gt;"</span></span><span>;
}

<span class="hljs-comment">/*
Résultat de sortie：
personnage 'A' Oui：lettre majuscule
personnage 'z' Oui：Lettres minuscules
personnage 'M' Oui：lettre majuscule
personnage 'm' Oui：Lettres minuscules
personnage '9' Oui：Pas en anglais
personnage '@' Oui：Pas en anglais
*/</span>

<span class="hljs-comment">/*
Résumer：
ord() 函数非常适合用于判断personnage类型，尤其Oui英文personnage的大小写判断。
只需获取personnage的 ASCII 编code，Alors selonASCIIcode范围做判断即可。
*/</span>
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