is_string
檢測變量是否是字符串
中文(繁體)
中文(繁體)
檢查變量是否為字符串類型：
<span class="token php language-php"><span class="token delimiter important"><？ php</span> <span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">“ Hello”</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ a是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ a</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ b</span> <span class="token operator">=</span> <span class="token number">0</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ b是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ b</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ C</span> <span class="token operator">=</span> <span class="token number">32</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ C是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ c</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ d</span> <span class="token operator">=</span> <span class="token string double-quoted-string">“ 32”</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ D是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ d</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ e</span> <span class="token operator">=</span> <span class="token constant boolean">true</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ e是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ e</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ f</span> <span class="token operator">=</span> <span class="token string double-quoted-string">“ null”</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ F是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ f</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token variable">$ g</span> <span class="token operator">=</span> <span class="token string double-quoted-string">“”</span> <span class="token punctuation">;</span> <span class="token keyword">迴聲</span><span class="token string double-quoted-string">“ G是”</span> <span class="token operator">。</span> <span class="token punctuation">（</span> <span class="token function">is_string</span> <span class="token punctuation">（</span> <span class="token variable">$ g</span> <span class="token punctuation">）</span> <span class="token operator">？</span> <span class="token string single-quoted-string">'a string'</span> <span class="token punctuation">：</span> <span class="token string single-quoted-string">'不是字符串'</span> <span class="token punctuation">）</span> <span class="token operator">。</span> <span class="token string double-quoted-string">“ <br>”</span> <span class="token punctuation">;</span> <span class="token delimiter important">？ ></span></span>
is_numeric
get_defined_vars
doubleval
is_object
unset
unserialize
floatval
get_debug_type
