我想在这里访问'1'的值，我需要以下内容
$data['category'][0];
["category"]=> array(1) { [0]=> string(1) "1" }
但它不会返回任何内容。我将如何访问 string（1） 部分以获取值 1？
这是变量$data数组的完整 var 转储
array(18) { ["RET"]=> string(65) "/account/add-submission" ["URI"]=> string(22) "account/add-submission" ["XID"]=> string(40) "3ee1766dfdbe4684831021c99a9197beaede03be" ["return_url"]=> string(36) "account/submission-complete/ENTRY_ID" ["channel_id"]=> string(1) "4" ["entry_id"]=> string(1) "0" ["ACT"]=> string(1) "4" ["meta"]=> string(556) "pdKeUQVJTA6FeLnmeqtK0gGu2C1S2gKOvRrMDjjKMou7JAp2HVA48Gn+yXTjY4tKuBam5rlyszhe3rEF2eClOB5bRPEJ8NYeh/qPBSkDuhuk0j+XYrQ0R7dJhaHZPIr1b5sge8/kqmWj2qvrpO5pE/iC6X4scIO2HmOPjWb4Sea2VgGwgQ70j7Qr1QmHlQAIZ95DXMp3YkietUWLWaFKvr8XwSx+vUhKEaueVoAbP0Le3fu0rMqz2LuZIScGpwn4yPJbenkc0P5ME/nM9CsfnzYPmM1cwTHO1Xe/wtJ3HGbNcglfn+A9ubz1GBNULgUvxYAW6eFrhqfAJ2omfiwSzpQkISJaDZvZofjOCHjiS7VaUIDgWOrznOm7oWR3m5Ut4TOxmsX2jeKpUAvLJQppc1+1hormnRSA0mambV0uodflDaZEZbPKmjWxsZD3doNJzmIG29bQtBV+UWdQ4xkxyM6fhyMmUkKGAgE+Xegkp/zK7+AXc4s8bEBENPAa1UbCkh0XEq4IYIqWRzYL/T2bfyySCPzvrbFBErIwj3jUF+w=" ["return"]=> string(36) "account/submission-complete/ENTRY_ID" ["site_id"]=> string(1) "1" ["submission_file_hidden_file"]=> string(0) "" ["submission_file_hidden_dir"]=> string(1) "1" ["type"]=> string(3) "1.1" ["snap_FxlgTgCET"]=> string(13) "vyHdSjitmEUoV" ["submission_file"]=> string(37) "{filedir_1}Tharp_BIO_Pic300x20038.jpg" ["field_id_48"]=> string(37) "{filedir_1}Tharp_BIO_Pic300x20038.jpg" ["field_ft_48"]=> string(4) "none" ["revision_post"]=> array(26) { ["RET"]=> string(65) "/account/add-submission" ["URI"]=> string(22) "account/add-submission" ["XID"]=> string(40) "3ee1766dfdbe4684831021c99a9197beaede03be" ["return_url"]=> string(36) "account/submission-complete/ENTRY_ID" ["author_id"]=> string(1) "1" ["channel_id"]=> string(1) "4" ["entry_id"]=> string(1) "0" ["ACT"]=> string(1) "4" ["meta"]=> string(556) "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" ["return"]=> string(36) "account/submission-complete/ENTRY_ID" ["site_id"]=> string(1) "1" ["title"]=> string(3) "asd" ["submission_file_hidden_file"]=> string(0) "" ["submission_file_hidden_dir"]=> string(1) "1" ["type"]=> string(3) "1.1" ["category"]=> array(1) { [0]=> string(1) "1" } ["snap_FxlgTgCET"]=> string(13) "vyHdSjitmEUoV" ["submission_file"]=> string(24) "Tharp_BIO_Pic300x200.jpg" ["field_id_48_hidden_file"]=> string(0) "" ["field_id_48_hidden_dir"]=> string(1) "1" ["field_id_48"]=> string(24) "Tharp_BIO_Pic300x200.jpg" ["field_ft_48"]=> string(4) "none" ["allow_comments"]=> string(1) "y" ["entry_date"]=> string(10) "1380114180" ["status"]=> string(4) "open" ["previous_status"]=> bool(false) } }
要访问该数据，您必须使用$data['revision_post']['category'][0] category因为数组revision_post数组中。
$data['category'][0] 的值是一个数组。 所以你会像这样访问：
$data['category'][0] = array('1');
echo $data['category'][0][0];
通过复制并粘贴到此处亲自尝试一下 http://writecodeonline.com/php/