What are the classifications of PHP string functions
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Strpos returns the position of string An in string B (the result is a number)
The opposite PHP string function is that strrpos returns the position of string An in string B (the result is a number).
Addcslashes prepends a backslash "\" to the specified character, such as echo addcslashes ($string, "YMagol O"); / / adds a backslash "\" to the specified character "Ymai O".
Addslashes prepends a specific character in a string with a backslash "\" special character refers to single quotation mark, double quotation mark, null and backslash "\"
Strstr gets the substring from the position where the specified string An appears in string B to the end of string B.
Strrchr gets the substring from the position where the specified string An appears once in string B to the end of string B.
The array_push function is used to increase the specified value to the end of the array $array=array ("0" = > "Ming", "1" = > "day"); array_push ($array, "technology")
Print_r ($array); the running result is array ([0] = > Ming [1] = > Japan [2] = > Science and Technology)
In contrast, the PHP string function is used by array_unshift to increase the specified numeric value to the beginning of the array.
The array_pop function returns an element of an array. The opposite function is the array_shift function, which returns the elements of an array.
The array_unique function removes duplicate values from the specified array and returns a new array.
The array_merge function is used to combine multiple numbers together and return a new array.
The array_slice function is used to extract array elements of specified length from a specified location of the array, and save the extracted elements to a new array, such as $array=array ("I", "yes", "Hu", "rain", "Xuan").
$array1=array_slice ($array,2,3)
The value of $array1 is "Hu Yuxuan"
The PHP string function, by contrast, is used by the array_splice function to delete array elements that start at a specified location in the array and save the deleted elements to a new array.
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