{"id":427,"date":"2015-05-14T11:26:02","date_gmt":"2015-05-14T11:26:02","guid":{"rendered":"18997733ec258a9fcaf239cc55d53363"},"modified":"2015-05-14T11:26:02","modified_gmt":"2015-05-14T11:26:02","slug":"","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/427","title":{"rendered":"strace ltrace \u8c03\u8bd5php"},"content":{"rendered":"

\u4ee5\u5206\u6790 in_array \u4e3a\u4f8b<\/code><\/p>\n

shell$ time \/usr\/local\/php\/bin\/php test.php<\/code><\/p>\n

<\/code> <\/p>\n

real 0m1.132s
\nuser 0m1.118s
\nsys 0m0.015s<\/code><\/p>\n

<\/code> <\/p>\n

shell$ strace -ttt -o xxx \/usr\/local\/php\/bin\/php test.php<\/span>

\nshell$ less xxx<\/span><\/code><\/p>\n

\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a> <\/p>\n

\u770b\u5230\u8fd9\u4e24\u6b21\u7cfb\u7edf\u8c03\u7528\u4e4b\u95f4\u7684\u5ef6\u65f6\u975e\u5e38\u5927\uff0c\u5374\u5e76\u4e0d\u77e5\u9053\u5e72\u4e86\u4ec0\u4e48\uff1f\u4e00\u7b79\u83ab\u5c55\u4e86\uff0c\u5e78\u597d\uff0cLinux\u4e0b\u7684\u8c03\u8bd5\u5229\u5668\u9664\u4e86strace\u8fd8\u6709ltrace(\u5f53\u7136\u8fd8\u6709dtrace\uff0cptrace\uff0c\u4e0d\u5728\u672c\u6587\u8ba8\u8bba\u8303\u56f4\u4e86\uff0c\u7565\u53bb)\u3002<\/p>\n

\n

\u5f15\u7528\uff1astrace\u7528\u6765 \u8ddf\u8e2a\u4e00\u4e2a\u8fdb\u7a0b\u7684\u7cfb\u7edf\u8c03\u7528\u6216\u4fe1\u53f7\u4ea7\u751f\u7684\u60c5\u51b5\uff0c\u800c ltrace\u7528\u6765 \u8ddf\u8e2a\u8fdb\u7a0b\u8c03\u7528\u5e93\u51fd\u6570\u7684\u60c5\u51b5\uff08via <\/span>IBM developerworks<\/a>\uff09\u3002<\/p>\n<\/blockquote>\n

\u4e3a\u4e86\u6392\u9664\u5e72\u6270\u56e0\u7d20\uff0c\u5c06$x\u76f4\u63a5\u8d4b\u503c\u4e3aarray(\u201c0\u2033,\u201d1\u2033,\u201d2\u2033,\u2026\u2026)\u7684\u5f62\u5f0f\uff0c\u907f\u514d\u8fc7\u591a\u7684malloc\u8c03\u7528\u5f71\u54cd\u7ed3\u679c\u3002\u6267\u884c<\/p>\n

<\/p>\n

\nshell$ ltrace -c \/usr\/local\/php\/bin\/php test.php<\/p>\n

\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n

\u770b\u5230\u5e93\u51fd\u6570__strtol_internal\u7684\u8c03\u7528\u975e\u5e38\u4e4b\u9891\u7e41\uff0c\u8fbe\u5230\u4e8694%\uff0c\u592a\u5938\u5f20\u4e86\uff0c\u7136\u540e\u6211\u53c8\u67e5\u4e86\u4e00\u4e0b\u8fd9\u4e2a<\/span>\u5e93\u51fd\u6570__strtol_internal\u662f\u5e72\u561b\u7684<\/a>\uff0c\u539f\u6765\u662f<\/span>strtol<\/a>\u7684\u522b\u540d\uff0c\u7b80\u5355\u7684\u8bf4\u5c31\u662f\u628a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u957f\u6574\u5f62\uff0c\u53ef\u4ee5\u731c\u6d4bPHP\u5f15\u64ce\u5df2\u7ecf\u68c0\u6d4b\u5230\u8fd9\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u578b\u7684\u6570\u5b57\uff0c\u6240\u4ee5\u671f\u671b\u5c06\u4ed6\u4eec\u8f6c\u6362\u6210\u957f\u6574\u578b\u6765\u6bd4\u8f83\uff0c\u8fd9\u4e2a\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u6d88\u8017\u4e86\u592a\u591a\u65f6\u95f4\uff0c\u6211\u4eec\u518d\u6b21\u6267\u884c:<\/span>

\n
\nshell$ ltrace -e \"__strtol_internal\" \/usr\/local\/php\/bin\/php test.php
\n<\/code>

\n\u53ef\u4ee5\u8f7b\u677e\u6293\u5230\u5927\u91cf\u4e0b\u56fe\u8fd9\u6837\u7684\u8c03\u7528\uff0c\u5230\u6b64\uff0c\u95ee\u9898\u627e\u5230\u4e86\uff0cin_array\u8fd9\u79cd\u677e\u6bd4\u8f83\uff0c\u4f1a\u5c06\u4e24\u4e2a\u5b57\u7b26\u578b\u6570\u5b57\u4e32\u5148\u8f6c\u6362\u4e3a\u957f\u6574\u578b\u518d\u8fdb\u884c\u6bd4\u8f83\uff0c\u5374\u4e0d\u77e5\u6027\u80fd\u5c31\u8017\u5728\u8fd9\u4e0a\u9762\u4e86\u3002<\/span><\/p>\n

\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/span><\/p>\n

\u77e5\u9053\u4e86\u75c7\u7ed3\u6240\u5728\uff0c\u6211\u4eec\u89e3\u51b3\u7684\u529e\u6cd5\u5c31\u5f88\u591a\u4e86\uff0c\u6700\u7b80\u5355\u7684\u5c31\u662f\u4e3ain_array\u52a0\u7b2c\u4e09\u4e2a\u53c2\u6570\u4e3atrue\uff0c\u5373\u53d8\u4e3a\u4e25\u683c\u6bd4\u8f83\uff0c\u540c\u65f6\u8fd8\u8981\u6bd4\u8f83\u7c7b\u578b\uff0c\u8fd9\u6837\u907f\u514d\u4e86PHP\u81ea\u4f5c\u806a\u660e\u7684\u8f6c\u6362\u7c7b\u578b\uff0c\u8dd1\u8d77\u6765\u679c\u7136\u5feb\u591a\u4e86\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/span><\/p>\n

<\/p>\n

<?php\r\n$y=\"1800\";\r\n$x = array();\r\nfor($j=0;$j<2000;$j++){\r\n        $x[]= \"{$j}\";\r\n}\r\n \r\nfor($i=0;$i<3000;$i++){\r\n        if(in_array($y,$x,true)){\r\n                continue;\r\n        }\r\n}\r\n?><\/span><\/span><\/pre>\n
 <\/p>\n
shell$ time \/usr\/local\/php\/bin\/php test.php<\/code><\/p>\n
<\/code> <\/p>\n
real 0m0.267s
\nuser 0m0.247s
\nsys 0m0.020s
\n<\/code><\/p>\n
\u5feb\u4e86\u597d\u591a\u500d\u554a\uff01\uff01\uff01\u53ef\u4ee5\u770b\u5230sys\u8017\u65f6\u51e0\u4e4e\u6ca1\u6709\u592a\u5927\u53d8\u5316\u3002\u6211\u4eec\u518d\u6b21ltrace\u4e00\u628a\uff0c\u8fd8\u662f\u8981\u628a$x\u76f4\u63a5\u8d4b\u503c\uff0c\u6392\u9664malloc\u8c03\u7528\u7684\u5e72\u6270\uff0c\u56e0\u4e3a\u6211\u4eec\u5b9e\u9645\u5e94\u7528\u4e2d\u662f\u4ece\u7f13\u5b58\u91cc\u4e00\u6b21\u62c9\u51fa\u6765\u7684\uff0c\u6240\u4ee5\u4e5f\u4e0d\u5b58\u5728\u793a\u4f8b\u4ee3\u7801\u4e2d\u8fd9\u6837\u7684\u5faa\u73af\u6765\u7533\u8bf7\u5185\u5b58\u7684\u60c5\u51b5\u3002
\n\u518d\u6b21\u6267\u884c
\n
\nshell$ ltrace -c \/usr\/local\/php\/bin\/php test.php
\n<\/code>
\n\u5982\u4e0b\u56fe:<\/p>\n
<\/span><\/span> <\/p>\n
 \"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n
 <\/p>\n
<\/code><\/span><\/code><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4ee5\u5206\u6790 in_array \u4e3a\u4f8b<\/code><\/p>\n
shell$ time \/usr\/local\/php\/bin\/php test.php<\/code><\/p>\n
real 0m1.132s
\nuser 0m1.118s
\nsys 0m0.015s<\/code><\/p>\n
 <\/p>\n
shell$ strace -ttt -o xxx \/usr\/local\/php\/bin\/php test.php<\/span>
shell$ less xxx<\/span><\/code><\/p>\n
\"\u70b9\u51fb\u67e5\u770b\u539f\u56fe\"<\/a><\/p>\n
\u770b\u5230\u8fd9\u4e24\u6b21\u7cfb\u7edf\u8c03\u7528\u4e4b\u95f4\u7684\u5ef6\u65f6\u975e\u5e38\u5927\uff0c\u5374\u5e76\u4e0d\u77e5\u9053\u5e72\u4e86\u4ec0\u4e48\uff1f\u4e00\u7b79\u83ab\u5c55\u4e86\uff0c\u5e78\u597d\uff0cLinux\u4e0b\u7684\u8c03\u8bd5\u5229\u5668\u9664\u4e86strace\u8fd8\u6709ltrace(\u5f53\u7136\u8fd8\u6709dtrace\uff0cptrace\uff0c\u4e0d\u5728\u672c\u6587\u8ba8\u8bba\u8303\u56f4\u4e86\uff0c\u7565\u53bb)\u3002<\/p>\n
\n
\u5f15\u7528\uff1astrace\u7528\u6765 \u8ddf\u8e2a\u4e00\u4e2a\u8fdb\u7a0b\u7684\u7cfb\u7edf\u8c03\u7528\u6216\u4fe1...<\/p>\n<\/blockquote>\n
<\/p>\n
<\/span><\/span><\/pre>\n
<\/p>\n
<\/span><\/span><\/code><\/span><\/code> \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[278],"tags":[],"class_list":["post-427","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/427","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=427"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/427\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}