is_scalar
检测变量是否是一个标量
简体中文
简体中文
检查变量是否为标量：
<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>
unserialize
isset
is_object
settype
get_defined_vars
is_null
is_string
boolval
