PHP判断是否是序列化字符串数据的函数
判断一个字符串是否属于序列化后的数据
function is_serialized( $data ) { $data = trim( $data ); if ( 'N;' == $data ) return true; if ( !preg_match( '/^([adObis]):/', $data, $badions ) ) return false; switch ( $badions[1] ) { case 'a' : case 'O' : case 's' : if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) ) return true; break; case 'b' : case 'i' : case 'd' : if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) ) return true; break; } return false; }

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In PHP, you can use the ord() function to convert characters into ascii code. This function can return the ASCII value of a single character or the first character in a string. The returned ASCII value will be displayed in integer form; the conversion syntax "ord (string)", the parameter "string" cannot be omitted, it is the string (or single character) from which the ASCII value is to be obtained.

There are two ways to replace a certain character with a null character in a PHP string: 1. Use the str_replace() function to replace the specified character with a null character. You only need to set the first parameter to the specified character and the second parameter to a null character. Syntax "str_replace("specified character","", $str)"; 2. Use the preg_replace() function with regular expressions to match the specified character and replace it with the null character, syntax "preg_replace('/specified character/', "",$str)".

Two removal methods: 1. Use preg_replace() to execute a regular expression to search for all uppercase letters and replace them with null characters. The syntax is "preg_replace('/[A-Z]/','',$str)". 2. Use preg_filter() to execute a regular expression to search for all uppercase letters and replace them with empty characters. The syntax is "preg_filter('/[A-Z]/','',$str)".

Two methods: 1. Use preg_match_all() with regular filter strings, the syntax is "preg_match_all("/[\x{4e00}-\x{9fff}]+/u","$str",$arr);" ; 2. Use preg_replace() with regular search for non-Chinese letters in the string and replace them with empty characters. The syntax is "preg_replace("/[^\x{4E00}-\x{9FFF}]+/u" ,'',$str)".

PHP is a very popular programming language and one of the preferred tools for building dynamic websites. In PHP development, we often need to operate strings, and one common requirement is to remove double quotes from strings. In this article, we will introduce some methods to remove double quotes from PHP strings.

There are two types of PHP string delimiters: 1. Heredoc delimiter. After the "<<<" operator, an identifier must be provided, followed by a newline, followed by the string itself, and finally the previously defined identifier must be used. as an end sign. 2. Nowdoc delimiter. After the "<<<" operator, an identifier enclosed in single quotes must be provided, followed by a newline, followed by the string itself, and finally the previously defined identifier must be used as the end mark.

PHP is a typed programming language that is often used to develop web applications. During web development, you may need to perform various operations on strings, such as removing specific characters from a string, retaining numbers or letters in a string, etc. In this article, we will focus on how to remove specific characters on the left or right side of a string in PHP.

3 conversion methods: 1. Use the dechex() function to convert decimal numbers into hexadecimal strings. The syntax is "dechex (specified data value);". 2. Use the base_convert() function to convert any base value into a hexadecimal string. The syntax is "base_convert(data value, original base, 16);". 3. Use the bin2hex() function to convert a string of ASCII characters into a hexadecimal string, with the syntax "bin2hex (data value)".
