{"id":38,"date":"2014-07-24T11:30:19","date_gmt":"2014-07-24T03:30:19","guid":{"rendered":"http:\/\/www.phpzl.com\/?p=38"},"modified":"2014-07-24T11:30:19","modified_gmt":"2014-07-24T03:30:19","slug":"php%e4%b8%ad%e5%b0%86%e5%ad%97%e7%ac%a6%e4%b8%b2%e8%bd%ac%e5%8c%96%e4%b8%ba%e6%95%b4%e6%95%b0int-intval-printf","status":"publish","type":"post","link":"http:\/\/www.phpzl.com\/?p=38","title":{"rendered":"PHP\u4e2d\u5c06\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570(int) intval() printf()"},"content":{"rendered":"

\u80cc\u666f\u3001\u6982\u8ff0
\n<\/strong>\u3000\u3000\u65e9\u5728Sql\u6ce8\u5165\u6a2a\u884c\u7684\u524d\u51e0\u5e74\uff0c\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570\u5c31\u5df2\u7ecf\u88ab\u5217\u4e3a\u6bcf\u4e2aweb\u7a0b\u5e8f\u5fc5\u5907\u7684\u64cd\u4f5c\u4e86\u3002web\u7a0b\u5e8f\u5c06get\u6216post\u6765\u7684id\u3001\u6574\u6570\u7b49\u503c\u5f3a\u5236\u7ecf\u8fc7\u8f6c\u5316\u51fd\u6570\u8f6c\u5316\u4e3a\u6574\u6570\uff0c\u8fc7\u6ee4\u6389\u5371\u9669\u5b57\u7b26\uff0c\u5c3d\u53ef\u80fd\u964d\u4f4e\u7cfb\u7edf\u672c\u8eab\u88abSql\u6ce8\u5165\u7684\u53ef\u80fd\u6027\u3002
\n\u73b0\u5982\u4eca\uff0c\u867d\u7136Sql\u6ce8\u5165\u5df2\u7ecf\u9010\u6e10\u6de1\u51fa\u5386\u53f2\u821e\u53f0\uff0c\u4f46\u662f\uff0c\u4e3a\u4e86\u4fdd\u8bc1web\u7a0b\u5e8f\u7684\u6b63\u5e38\u8fd0\u884c\uff0c\u51cf\u5c11\u51fa\u9519\u6982\u7387\uff0c\u66f4\u597d\u7684\u4fdd\u8bc1\u7528\u7684\u6ee1\u610f\u5ea6\uff0c\u6211\u4eec\u540c\u6837\u9700\u8981\u5c06\u7528\u6237\u7684\u4e0d\u6b63\u786e\u8f93\u5165\u8f6c\u5316\u4e3a\u6211\u4eec\u6240\u9700\u8981\u7684\u3002
\n\u8f6c\u5316\u65b9\u5f0f
\n\u5728PHP\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u75283\u79cd\u65b9\u5f0f\u5c06\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570\u3002
\n1.\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u65b9\u5f0f
\n<\/strong>\u3000\u3000\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u65b9\u5f0f\uff0c\u5c31\u662f\u201c\u5728\u8981\u8f6c\u6362\u7684\u53d8\u91cf\u4e4b\u524d\u52a0\u4e0a\u7528\u62ec\u53f7\u62ec\u8d77\u6765\u7684\u76ee\u6807\u7c7b\u578b\u201d\uff08\u6458\u81eaPHP\u624b\u518c\u201c\u7c7b\u578b\u620f\u6cd5\u201d\u8282\uff09\u7684\u65b9\u5f0f\u3002<\/p>\n

\u7801<\/span>\u4ee3\u7801\u5982\u4e0b:<\/span><\/p>\n

\n<?php
\n$foo = “1”; \/\/ $foo \u662f\u5b57\u7b26\u4e32\u7c7b\u578b
\n$bar = (int)$foo; \/\/ $bar \u662f\u6574\u578b
\n?><\/div>\n

\u5bf9\u4e8e\u6574\u578b\u6765\u8bf4\uff0c\u5f3a\u5236\u8f6c\u6362\u7c7b\u578b\u540d\u79f0\u4e3aint\u6216\u8005integer\u3002
\n2.\u5185\u7f6e\u51fd\u6570\u65b9\u5f0f
\n<\/strong>\u3000\u3000\u5185\u7f6e\u51fd\u6570\u65b9\u5f0f\uff0c\u5c31\u662f\u4f7f\u7528PHP\u7684\u5185\u7f6e\u51fd\u6570intval\u8fdb\u884c\u53d8\u91cf\u7684\u8f6c\u6362\u64cd\u4f5c\u3002<\/p>\n

<\/a>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\n$foo = “1”; \/\/ $foo \u662f\u5b57\u7b26\u4e32\u7c7b\u578b
\n$bar = intval($foo); \/\/ $bar \u662f\u6574\u578b
\n?><\/div>\n

intval\u51fd\u6570\u7684\u683c\u5f0f\u4e3a\uff1a
\n<\/strong>\u3000\u3000int intval(mixed $var [, int $base]); \uff08\u6458\u81eaPHP\u624b\u518c\uff09
\n\u867d\u7136PHP\u624b\u518c\u4e2d\u660e\u786e\u6307\u51fa\uff0cintval()\u4e0d\u80fd\u7528\u4e8earray\u548cobject\u7684\u8f6c\u6362\u3002\u4f46\u662f\u7ecf\u8fc7\u6211\u6d4b\u8bd5\uff0c\u8f6c\u6362array\u7684\u65f6\u5019\u4e0d\u4f1a\u51fa\u4efb\u4f55\u95ee\u9898\uff0c\u8f6c\u6362\u503c\u4e3a1\uff0c\u800c\u4e0d\u662f\u60f3\u8c61\u4e2d\u76840\u3002\u6050\u6015\u662f\u56e0\u4e3a\u5728PHP\u5185\u90e8\uff0carray\u7c7b\u578b\u7684\u53d8\u91cf\u4e5f\u88ab\u8ba4\u4e3a\u662f\u975e\u96f6\u503c\u5f97\u7f18\u6545\u5427\u3002\u8f6c\u6362object\u7684\u65f6\u5019\uff0cPHP\u4f1a\u7ed9\u51fa\u5982\u4e0b\u7684 notice\uff1a
\nObject of class xxxx could not be converted to int in xxxxx.php on line xx
\n\u8f6c\u6362\u503c\u540c\u6837\u4e3a1\u3002
\n3.\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u5f0f<\/strong>
\n\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u5f0f\uff0c\u662f\u5229\u7528sprintf\u7684%d\u683c\u5f0f\u5316\u6307\u5b9a\u7684\u53d8\u91cf\uff0c\u4ee5\u8fbe\u5230\u7c7b\u578b\u8f6c\u6362\u7684\u76ee\u7684\u3002<\/p>\n

<\/a>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\n$foo = “1”; \/\/ $foo \u662f\u5b57\u7b26\u4e32\u7c7b\u578b
\n$bar = sprintf(“%d”, $foo); \/\/ $bar \u662f\u5b57\u7b26\u4e32\u7c7b\u578b
\n?><\/div>\n

\u4e25\u683c\u610f\u4e49\u4e0a\u8bb2sprintf\u7684\u8f6c\u6362\u7ed3\u679c\u8fd8\u662fstring\u578b\uff0c\u56e0\u6b64\u5b83\u4e0d\u5e94\u8be5\u7b97\u662f\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570\u7684\u65b9\u5f0f\u3002\u4f46\u662f\u7ecf\u8fc7\u4ed6\u5904\u7406\u4e4b\u540e\u7684\u5b57\u7b26\u4e32\u503c\u786e\u5b9e\u5df2\u7ecf\u6210\u4e3a\u4e86\u201c\u88ab\u5f3a\u5236\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6574\u6570\u201d\u3002
\n\u5b9e\u9645\u6d4b\u8bd5
\n\u4e0a\u9762\u4ecb\u7ecd\u4e86PHP\u4e2d\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570\u76843\u79cd\u65b9\u5f0f\u3002\u5bf9\u4e8e\u4e00\u822c\u7684\u7a0b\u5e8f\u5458\u6765\u8bf4\uff0c\u770b\u5230\u8fd9\u91cc\u5c31\u7b97\u7ed3\u675f\u4e86\uff0c\u4e0b\u9762\u7684\u90e8\u5206\u662f\u9488\u5bf9\u53d8\u6001\u7a0b\u5e8f\u5458\u7684\u3002
\n1.\u57fa\u672c\u529f\u80fd\u6d4b\u8bd5
\n<\/strong>\u3000\u3000\u8bbe\u5b9a\u4ee5\u4e0b\u6570\u7ec4\uff1a<\/p>\n

<\/a>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\n$a[] = “1”;
\n$a[] = “a1”;
\n$a[] = “1a”;
\n$a[] = “1a2”;
\n$a[] = “0”;
\n$a[] = array(‘4’,2);
\n$a[] = “2.3”;
\n$a[] = “-1”;
\n$a[] = new Directory();
\n?><\/div>\n

\u4f7f\u7528\u4e09\u79cd\u65b9\u5f0f\u4f9d\u6b21\u8f6c\u5316\u4e0a\u9762\u7ed9\u51fa\u7684\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u67e5\u770b\u8f6c\u6362\u60c5\u51b5\u3002\u7a0b\u5e8f\u6e90\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

<\/a>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\n$a[] = “1”;
\n$a[] = “a1”;
\n$a[] = “1a”;
\n$a[] = “1a2”;
\n$a[] = “0”;
\n$a[] = array(‘4’,2);
\n$a[] = “2.3”;
\n$a[] = “-1”;
\n$a[] = new Directory();
\n\/\/ int
\nprint “(int)<br \/>”;
\nforeach($a as $v)
\n{
\nvar_dump((int)$v);
\nprint “<br \/>”;
\n}
\n\/\/ intval
\nprint “intval();<br \/>”;
\nforeach($a as $v)
\n{
\nvar_dump(intval($v));
\nprint “<br \/>”;
\n}
\n\/\/ sprintf
\nprint “sprintf();<br \/>”;
\nforeach($a as $v)
\n{
\nvar_dump(sprintf(“%d”, $v));
\nprint “<br \/>”;
\n}
\n?><\/div>\n

\u7a0b\u5e8f\u7684\u6700\u7ec8\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff08\u5df2\u7ecf\u53bb\u6389\u8f6c\u6362object\u65f6\u51fa\u73b0\u7684notice\uff09\uff1a
\n(int)
\nint(1)
\nint(0)
\nint(1)
\nint(1)
\nint(0)
\nint(1)
\nint(2)
\nint(-1)
\nint(1)
\nintval();
\nint(1)
\nint(0)
\nint(1)
\nint(1)
\nint(0)
\nint(1)
\nint(2)
\nint(-1)
\nint(1)
\nsprintf();
\nstring(1) “1”
\nstring(1) “0”
\nstring(1) “1”
\nstring(1) “1”
\nstring(1) “0”
\nstring(1) “1”
\nstring(1) “2”
\nstring(2) “-1”
\nstring(1) “1”
\n\u7531\u6b64\u53ef\u4ee5\u770b\u51fa\uff0c\u4e09\u79cd\u8f6c\u6362\u7684\u7ed3\u679c\u662f\u5b8c\u5168\u4e00\u6837\u7684\u3002\u90a3\u4e48\u4ece\u529f\u80fd\u4e0a\u8bb2\uff0c3\u79cd\u65b9\u5f0f\u90fd\u53ef\u4ee5\u80dc\u4efb\u8f6c\u6362\u5de5\u4f5c\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u5de5\u4f5c\u5c31\u662f\u770b\u54ea\u4e00\u79cd\u6548\u7387\u66f4\u9ad8\u4e86\u3002
\n2.\u6027\u80fd\u6d4b\u8bd5<\/strong>
\n\u88ab\u6d4b\u8bd5\u5b57\u7b26\u4e32\u662f\u6211\u4eec\u5728\u6ce8\u5165\u5de5\u4f5c\u4e2d\u53ef\u80fd\u4f1a\u4f7f\u7528\u5230\u7684\u4e00\u79cd\uff1a<\/p>\n

<\/a>\u590d\u5236\u4ee3\u7801<\/span>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\n$foo = “1′;Select * …”;
\n?>
\n\u83b7\u53d6\u65f6\u95f4\u70b9\u7684\u51fd\u6570\u5982\u4e0b\uff08\u7528\u4e8e\u83b7\u53d6\u6d4b\u8bd5\u8d77\u59cb\u70b9\u548c\u7ed3\u675f\u70b9\uff0c\u4ee5\u8ba1\u7b97\u6d88\u8017\u65f6\u95f4\uff09\uff1a<\/p>\n

<?php
\n**
\n* Simple function to replicate PHP 5 behaviour
\n*\/
\nfunction microtime_float()
\n{
\nlist($usec, $sec) = explode(” “, microtime());
\nreturn ((float)$usec + (float)$sec);
\n}
\n?><\/p><\/div>\n

\uff08\u6458\u81eaPHP\u624b\u518cmicrotime()\u51fd\u6570\u8282\uff09
\n\u6d4b\u8bd5\u8fc7\u7a0b\u662f\u4f7f\u7528\u6bcf\u79cd\u65b9\u5f0f\u8f6c\u6362\u53d8\u91cf$foo 1000000\u6b21\uff08100\u4e07\u6b21\uff09\uff0c\u5e76\u5c06\u5404\u81ea\u7684\u6d88\u8017\u65f6\u95f4\u8f93\u51fa\uff0c\u603b\u5171\u8fdb\u884c\u4e09\u7ec4\u6d4b\u8bd5\uff0c\u5c3d\u53ef\u80fd\u964d\u4f4e\u8bef\u5dee\u3002\u6d4b\u8bd5\u7a0b\u5e8f\u5982\u4e0b\uff1a<\/p>\n

<\/a>\u590d\u5236\u4ee3\u7801<\/span>\u4ee3\u7801\u5982\u4e0b:<\/div>\n
\n<?php
\nfunction microtime_float()
\n{
\nlist($usec, $sec) = explode(” “, microtime());
\nreturn ((float)$usec + (float)$sec);
\n}
\n$foo = “1′;Select * …”;<\/p>\n

\/\/ (int)
\n$fStart = microtime_float();
\nfor($i=0;$i<1000000;$i++)
\n{
\n$bar = (int)$foo;
\n}
\n$fEnd = microtime_float();
\nprint “(int):” . ($fEnd – $fStart) . “s<br \/>”;
\n\/\/ intval()
\n$fStart = microtime_float();
\nfor($i=0;$i<1000000;$i++)
\n{
\n$bar = intval($foo);
\n}
\n$fEnd = microtime_float();
\nprint “intval():” . ($fEnd – $fStart) . “s<br \/>”;
\n\/\/ sprintf()
\n$fStart = microtime_float();
\nfor($i=0;$i<1000000;$i++)
\n{
\n$bar = sprintf(“%d”, $foo);
\n}
\n$fEnd = microtime_float();
\nprint “sprintf():” . ($fEnd – $fStart) . “s<br \/>”;
\n?><\/p><\/div>\n

\u6700\u7ec8\u7684\u6d4b\u8bd5\u7ed3\u679c\uff1a
\n(int):0.67205619812012s
\nintval():1.1603000164032s
\nsprintf():2.1068270206451s
\n(int):0.66051411628723s
\nintval():1.1493890285492s
\nsprintf():2.1008238792419s
\n(int):0.66878795623779s
\nintval():1.1613430976868s
\nsprintf():2.0976209640503s<\/p>\n

\u867d\u7136\u8fd9\u4e2a\u6d4b\u8bd5\u6709\u70b9\u53d8\u6001\uff08\u8c01\u4f1a\u8fde\u7eed\u8f6c\u6362100w\u6b21\u7684\u6574\u6570\uff1f\uff09\uff0c\u4f46\u662f\u7531\u6b64\u53ef\u4ee5\u770b\u51fa\uff0c\u4f7f\u7528\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u5c06\u5b57\u7b26\u4e32\u8f6c\u5316\u4e3a\u6574\u6570\u901f\u5ea6\u662f\u6700\u5feb\u7684\u3002
\n\u603b\u7ed3
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