is_scalar
檢測變量是否是一個標量
中文(繁體)
中文(繁體)
檢查變量是否為標量：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello"</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"a is "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_scalar</span> <span class="token punctuation">(</span> <span class="token variable">$a</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">'scalar'</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">'not scalar'</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">$b</span> <span class="token operator">=</span> <span class="token number">0</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"b is "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_scalar</span> <span class="token punctuation">(</span> <span class="token variable">$b</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">'scalar'</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">'not scalar'</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">$c</span> <span class="token operator">=</span> <span class="token number">32</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"c is "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_scalar</span> <span class="token punctuation">(</span> <span class="token variable">$c</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">'scalar'</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">'not scalar'</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">$d</span> <span class="token operator">=</span> <span class="token constant">NULL</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"d is "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_scalar</span> <span class="token punctuation">(</span> <span class="token variable">$d</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">'scalar'</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">'not scalar'</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">$e</span> <span class="token operator">=</span> <span class="token keyword">array</span> <span class="token punctuation">(</span> <span class="token string double-quoted-string">"red"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"green"</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"blue"</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token string double-quoted-string">"e is "</span> <span class="token operator">.</span> <span class="token punctuation">(</span> <span class="token function">is_scalar</span> <span class="token punctuation">(</span> <span class="token variable">$e</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token string single-quoted-string">'scalar'</span> <span class="token punctuation">:</span> <span class="token string single-quoted-string">'not scalar'</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_double
is_resource
get_debug_type
is_callable
serialize
strval
get_resource_id
empty
