sprintf
返回格式化的字符串
简体中文
简体中文
把百分号（%）符号替换成一个作为参数进行传递的变量：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$number</span> <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span> <span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Shanghai"</span><span class="token punctuation">;</span> <span class="token variable">$txt</span> <span class="token operator">=</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"There are %u million cars in %s."</span><span class="token punctuation">,</span><span class="token variable">$number</span><span class="token punctuation">,</span><span class="token variable">$str</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token variable">$txt</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
使用格式值 %f：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$number</span> <span class="token operator">=</span> <span class="token number">123</span><span class="token punctuation">;</span> <span class="token variable">$txt</span> <span class="token operator">=</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%f"</span><span class="token punctuation">,</span><span class="token variable">$number</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token variable">$txt</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
使用占位符：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$number</span> <span class="token operator">=</span> <span class="token number">123</span><span class="token punctuation">;</span> <span class="token variable">$txt</span> <span class="token operator">=</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"带两位小数：%1\$.2f <br>不带小数：%1\$u"</span><span class="token punctuation">,</span><span class="token variable">$number</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token variable">$txt</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
对所有可能的格式值的演示：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$num1</span> <span class="token operator">=</span> <span class="token number">123456789</span><span class="token punctuation">;</span> <span class="token variable">$num2</span> <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">123456789</span><span class="token punctuation">;</span> <span class="token variable">$char</span> <span class="token operator">=</span> <span class="token number">50</span><span class="token punctuation">;</span> <span class="token comment">// ASCII 字符 50 是 2</span> <span class="token comment">// 注释：格式值 "%%" 返回百分号</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%b = %b"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 二进制数</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%c = %c"</span><span class="token punctuation">,</span><span class="token variable">$char</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// ASCII 字符</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%d = %d"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 带符号的十进制数</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%d = %d"</span><span class="token punctuation">,</span><span class="token variable">$num2</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 带符号的十进制数</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%e = %e"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 科学计数法（小写）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%E = %E"</span><span class="token punctuation">,</span><span class="token variable">$num1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 科学计数法（大写）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%u = %u"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 不带符号的十进制数（正）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%u = %u"</span><span class="token punctuation">,</span><span class="token variable">$num2</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 不带符号的十进制数（负）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%f = %f"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 浮点数（视本地设置）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%F = %F"</span><span class="token punctuation">,</span><span class="token variable">$num1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 浮点数（不视本地设置）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%g = %g"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 短于 %e 和 %f</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%G = %G"</span><span class="token punctuation">,</span><span class="token variable">$num1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 短于 %E 和 %f</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%o = %o"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 八进制数</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%s = %s"</span><span class="token punctuation">,</span><span class="token variable">$num1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 字符串</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%x = %x"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 十六进制数（小写）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%X = %X"</span><span class="token punctuation">,</span><span class="token variable">$num1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 十六进制数（大写）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%+d = %+d"</span><span class="token punctuation">,</span><span class="token variable">$num1</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 comment">// 符号说明符（正）</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"%%+d = %+d"</span><span class="token punctuation">,</span><span class="token variable">$num2</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token comment">// 符号说明符（负）</span> <span class="token delimiter important">?></span></span>
对字符串说明符的演示：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$str1</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello"</span><span class="token punctuation">;</span> <span class="token variable">$str2</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello world!"</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%s]"</span><span class="token punctuation">,</span><span class="token variable">$str1</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 keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%8s]"</span><span class="token punctuation">,</span><span class="token variable">$str1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%-8s]"</span><span class="token punctuation">,</span><span class="token variable">$str1</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 keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%08s]"</span><span class="token punctuation">,</span><span class="token variable">$str1</span><span class="token punctuation">)</span><span class="token operator">.</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span> <span class="token keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%'*8s]"</span><span class="token punctuation">,</span><span class="token variable">$str1</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 keyword">echo</span> <span class="token function">sprintf</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"[%8.8s]"</span><span class="token punctuation">,</span><span class="token variable">$str2</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>
str_replace
echo
localeconv
strcoll
md5_file
lcfirst
stripos
strrpos
