This article mainly introduces the function quick check about php, which has certain reference value. Now I share it with everyone. Friends in need can refer to it
Quick check
字符串 计算 1.min()算最小值 2.max()算最大值 3.ceil()向上取整 4.floor()向下取整 5.mt_rand()随机数 6.trim()删除字符串两边的空格 7.rtrim()删除右边的空格别名:chop() 8.ltrim()删除左边的空格 9.dirname() 从文件路径获取文件夹路径 10.str_repeat()生成重复的字符串 11.str_split()切割字符串 12.strrev()颠倒循序字符串 13.wordwrap($str,15)指定15字节换行 14.str_shuffle()随机打乱字符串 15.parse_str("id=23&name=John%20Adams", $myArray);将url参数转为数组 16.number_format()千分位 17.strtolower()将字符串转为小写 18.strtoupper()将字符串转为大写 19.ucfirst()将字符串的首字母大写 20.htmlentities()将html代码直接输出 21.strip_tags()过滤html 22.quotemeta()将特殊字符转义 23.substr_count()统计字符串出现次数 24.str_replace()字符串替换 25.strrchr()字符串截取(最后出现的位置) 26.strchr()字符串截取 别名strstr 27.stripos()字符串查找 28.strpos()字符串查找(区分大写) 数组 1.array_combine()将一数组作为键将另一数组作为值 2.range(): 随机生产数组 3.compact('变量名'):生成数组把变量名为键,变量的值为值 4.array_chunk()数组拆分 5.array_merge()合并数组 6.array_slice()数组截取 7.array_diff()返回数组不同的值 8.array_intersect()返回数组相同的值 9.array_search()查找字符串的值 10.array_splice()数组中一部分删除用其他值替代 11.in_array() 判断数组中是否存在这个值 12.array_key_exists()判断数组中是否存在这个键 13.array_shift()弹出第一元素并返回 14.array_unshif()往前面追加元素 15.array_pop()弹出最后一个元素 16.array_push()往后面追加一个元素 17.shuffle()随机打乱数组 18.array_reverse()颠倒数组 19.array_flip()键值替换 20.array_keys()返回所有键 21.array_count_values()统计值的出现次数 22.array_unique() 去除重复的值 22.array_column($arr, '数组的健','数组的健') 索引数组 第三个参数 使第三个参数的值作为键混合数组 23.array_sum() 统计数组所的值 24.assoc_unique() 去重函数 文件 1.fopen() 打开文件 2.fclose()关闭文件 3.file_exists() 判断文件是否存在 4.filesize() 获取文件大小 5.is_readable()判读文件是否可读 6.is_writable()判断文件是否可写 7.is_executable() 判断文件是否可执行 8.filectime()获取文件的创建时间 9.filemtime()获取文件更新时间 10.fileatime() 获取文件访问时间 11.fread()读取文件 12.opendir()打开文件夹 13.readdir()从目录句柄中读取条目 14.rmdir()删除文件夹 15.unlink()删除文件 16.rename()重命令文件夹或文件 时间 17.date_default_timezone_set()设定用于一个脚本中所有日期时间函数的默认时区 18.intval() 取变量的整数值 19. 其他用法: ...拿数组中的第一个值 func_get_args() 获取请求头的所以信息 $this->test(...func_get_args()); array_push() 追加 $arr[] = [1];维度不一样
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