PHP 是一种灵活的语言，拥有简单的数据类型系统。了解其基本到高级的数据类型对于编写有效且强大的 PHP 代码至关重要。这份 cheat sheet 将作为快速参考和指南，通过代码示例介绍 PHP 中的各种数据类型。<\/p>\n
PHP 支持四种基本数据类型：<\/p>\n
字符串：由字符组成的序列，可以使用单引号或双引号来指定。<\/p>\n
浮点数：带有小数点或指数形式的数字（例如，1.234 或 4E-10）。<\/p>\n
整数：PHP_INT_MIN 和 PHP_INT_MAX 之间的非十进制数。<\/p>\n
布尔类型只有两种值： 下面是展示PHP基本数据类型声明的示例：<\/p>\n PHP 也包含两种复合数据类型：<\/p>\n 对象：类的一个实例，能够持有属性和方法。<\/p>\n 数组：有序的映射表，可以包含其他数组，从而形成多维数组。<\/p>\n 以下是一些数组和对象声明示例：<\/p>\n PHP还具有两种特殊的数据类型：<\/p>\n 一个未赋值的变量。<\/p>\n 资源：一个引用外部资源的特殊变量。<\/p>\n 以下是资源和NULL数据类型的示例：<\/p>\n PHP 自动转换数据类型，这种功能称为类型混编。但是，也可以显式地进行类型转换。下面是两种示例：<\/p>\n 在更高级的应用程序中，理解常量数据类型、stdClass和迭代伪数据类型是有益的。常量允许指定不可变值。stdClass 是对象未声明（不显式转换为对象）时的对象默认类。Iterable 是在PHP 7.1 中引入的一种伪数据类型，允许对一组数据集进行交互操作。<\/p>\n 这个PHP数据类型速查表旨在帮助您快速上手PHP的核心数据类型。作为一种动态语言，PHP的学习曲线相对平缓，但对底层数据类型的深刻理解将显著提高代码的清晰度和效率。<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":" 介绍 PHP 是一种灵活的语言，拥有简单的数据类..<\/p>\n","protected":false},"author":1,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false},"tags":[],"my1js2nav":[38],"tuisongtax":[],"class_list":["post-399","my1js","type-my1js","status-publish","hentry","my1js2nav-jcyy"],"acf":{"qian_art_seotitle":"","qian_art_seotitle_source":{"label":"SEO\u6807\u9898","type":"text","formatted_value":""},"qian_art_seokws":"","qian_art_seokws_source":{"label":"SEO\u5173\u952e\u8bcd","type":"text","formatted_value":""},"qian_art_stzhong":"","qian_art_stzhong_source":{"label":"\u4e2d | \u77ed\u6807\u9898","type":"text","formatted_value":""}},"_links":{"self":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/my1js\/399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/my1js"}],"about":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/types\/my1js"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/media?parent=399"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/tags?post=399"},{"taxonomy":"my1js2nav","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/my1js2nav?post=399"},{"taxonomy":"tuisongtax","embeddable":true,"href":"https:\/\/www.zhaozhao123.cn\/php\/wp-json\/wp\/v2\/tuisongtax?post=399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}true<\/code>哦，是的。false<\/code>好的，请发送你需要翻译的内容。<\/p>\n<?php\n$boolean = TRUE; \/\/ A boolean\n$integer = 42; \/\/ An integer\n$float = 3.14; \/\/ A float\n$string = 'Hello, World!'; \/\/ A string\n?><\/code><\/pre>\n复合数据类型<\/h2>\n
<?php\n\/\/ Indexed array\n$array = array('Apple', 'Banana', 'Cherry');\n\n\/\/ Associative array\n$assocArray = array('color' => 'red', 'taste' => 'sweet');\n\n\/\/ Object creation using stdClass\n$object = new stdClass();\n$object->name = 'John';\n$object->age = 25;\n?><\/code><\/pre>\n特殊数据类型<\/h2>\n
<?php\n\/\/ Resource \n$resource = fopen('somefile.txt', 'r');\n\n\/\/ NULL\n$nullVar = NULL;\n?><\/code><\/pre>\n魔术表演和法术操作<\/h2>\n
<?php\n\/\/ Type Juggling\n$sum = '3' + 4; \/\/ $sum will be an integer (7)\n\n\/\/ Type Casting\n$sum = (int) '3' + 4; \/\/ $sum will be an integer (7)\n$bool = (bool) 1; \/\/ $bool will be a boolean (true)\n?><\/code><\/pre>\n高级PHP数据类型<\/h2>\n
<?php\n\/\/ Constants\ndefine('MY_CONSTANT', 123);\n\n\/\/ stdClass objects\n$user = new stdClass();\n$user->name = 'Alice';\n\n\/\/ Iterable\nfunction printIterable(iterable $myIterable) {\n foreach ($myIterable as $item) {\n echo $item;\n }\n}\n\n\/\/ Example usage\n$myArray = ['A', 'B', 'C'];\nprintIterable($myArray);\n?><\/code><\/pre>\n结论。<\/h2>\n