Summary of PHP Common String Functions of Recommendation
- 2021-10-25 06:12:34
- OfStack
1. Function to determine type
is_bool() // Determine whether it is Boolean
is_float() // Determine whether it is floating point type
is_real() // Ibid.
is_int() // Determine whether it is an integer
is_integer() // Ibid.
is_string() // Determine whether it is a string
is_object() // Judge whether it is an object or not
is_array() // Determine whether it is an array
is_null() // Determine whether it is null
is_file() // Determine whether it is a file
is_dir() // Determine whether it is a directory
is_numeric() // Determine whether it is a number
is_nan() // Judgment is not a number
is_resource() // Determine whether it is a resource type
is_a($obj,$classname) // Determine whether an object is an instance of a class
// Available if($obj instanceof Classname)
2. Get the substring position
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
3. Get a substring
substr($str,$start [,$length]); // Get a substring
substr_compare($main_str,$str,$offset[,$length]); // Substring comparison From offset Start comparison at
substr_count($hs,$nd [,$offset=0 [,$length]]); // Get a substring nd In hs Number of occurrences in
substr_replace($string,$replacement,$start [,$length]); // String substring replacement
// Use $replacement Replace $string From start Start length is length Substring of
strstr($hys,$nd [,bool $before_needle = false ]);// Return $nd In $hys No. 1 1 The beginning of the second occurrence to the end of the string String until
// No. 1 3 If the parameter is true Returns the $nd Previous string
stristr($hys,$nd [,bool $before_needle = false ]); // Same as above, ignoring the case version
strrchr($hys,$nd); // Return $nd In $hys Finally 1 The beginning of the second occurrence to the end of the string String until
//1 Equal harmony substr(strrchr($hys,$nd),strlen($nd)); Sharing
strpbrk($haystack,$char_list);// From $char_list Matches individual characters in turn in the $haystack Middle grade 1 The place where it appeared for the first time
// To the end of the string The entire string of
strtok($str,$token); // No. 1 1 Secondary use String by separator $token Segmentation
strtok($token); // No. 1 2 Secondary use
eg.
$string = "This is\tan example\nstring";
/* Use tabs and line breaks as delimiters */
$tok = strtok($string, " \n\t");
while ($tok !== false) {
echo "Word=$tok<br />";
$tok = strtok(" \n\t");
}
4. String str_ function
str_getcsv($str); // Will csv File string is converted to 1 Array of numbers
str_replace($search,$replace,$subject [,&$count]);// Search and replace strings
// No. 1 4 If a parameter is specified, it will be assigned the number of times it will be replaced
str_ireplace($search,$replace,$subject [,&$count]);// Search and replace strings
// No. 1 4 If a parameter is specified, it will be assigned the number of times it will be replaced Ignore case
str_shuffle(string $str);// Randomly scramble a string
str_split($str [,$len=1]);// Converts a string to a 1 Array of numbers
// The length of each array cell is $len
5. String length
strlen ($str); //String length
6. Flip the string
strrev (string $string); //Flip string
7. mb_ Type String Function
mb_ type string is basically the same as the above string function,
Just add one more optional character encoding parameter, which is the same as above
Here are 1 other useful functions
1. Detect the character encoding of the string
$encode = mb_detect_encoding($lines, array("ASCII","UTF-8","GB2312","GBK","BIG5"));
if($encode != "UTF-8"){
$lines = iconv($encode,"UTF-8", $lines);
}
8. String-related operations
1. Convert string types
strval($str); // Convert to string type
floatval($str);// Convert to floating point type
intval($str); // Convert to integer type 2. Case conversion
strtolower($str); // Convert all to lowercase
strtoupper($str); // Convert all to uppercase 3. String to timestamp
strtotime($str); // Convert a string in time format to an integer timestamp
// Pay attention to setting the time zone Otherwise there will be 8 Hourly error
4. Remove HTML and PHP labels
strip_tags($str [,$tags]);// Remove without $tags All labels outside the inside label
5. ascii to digital to ascii
chr(int $ascii); // Digital conversion to ascii
ord(string $str); // Return $str No. 1 1 Character of ascii Value
6. Encoding and decoding of json
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
7. Wrap lines and turn them < br/ >
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
8. Array to string, string to array
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
9. Thousand-bit partition formatting
string number_format ( float $number [, int $decimals = 0 ] )
string number_format ( float $number , int $decimals = 0 , string $dec_point = '.' , string $thousands_sep = ',' )
@param $number The number you want to format
$decimals Decimal places to keep
$dec_point Specifies the characters displayed by the decimal point
$thousands_sep Specifies the characters displayed by the thousand separator
10. Remove the blanks
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
This function deletes the white space character at the end of str and returns.
Without the second parameter, rtrim () removes only the following characters:
"" (ASCII 32 (0x20)), common white space.
"\ t" (ASCII 9 (0x09)), tabs.
"\ n" (ASCII 10 (0x0A)), line break.
"\ r" (ASCII 13 (0x0D)), carriage return.
• "\ 0" (ASCII 0 (0x00)), NUL null byte character.
"\ x0B" (ASCII 11 (0x0B), vertical tabs.
The filter character can also be specified by the charlist parameter. 1 to list all the characters you want to filter,
You can also use ".." to list a 1-character range
11. Transform string encoding function
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
12. String encryption function
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
13. String escape and inversion function
strpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the.
stripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs The position of the number that first appears in the , Case-insensitive.
strrpos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 The position of the number that occurs next time.
strripos($hs,$nd [,int $offset = 0 ]) // Return nd In hs Middle last 1 Number position of next occurrence , Case-insensitive.
14. Return data in format
sprintf - Return the data as required, but do not output it
The representable types are as follows:
string s
integer d, u, c, o, x, X, b
double g, G, e, E, f, F
eg.
$num = 5;
$location = 'tree';
$format = 'There are %d monkeys in the %s';
echo sprintf($format, $num, $location);