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In this article Xiaobian introduces in detail "what are the common functions for uploading PHP files" with detailed contents, clear steps, and proper handling of the details. I hope that this article, "what are the common functions for uploading PHP files?" can help you solve your doubts.

1. Deldot

The deldot function is a common function in upload-lab. It is actually a custom function defined in common.php. The function is defined as follows:

Function deldot ($s) {for ($I = strlen ($s)-1 and I > 0 return I -) {$c = substr ($s); if ($I = = strlen ($s)-1 and $c! ='.') {return $s } if ($c! ='.') {return substr

That is, start at the end of the string and delete the dot from back to front until the end character of the string is not. So far.

So for the following input

Echo deldot ("hello world"). "\ n"; echo deldot ("hello world."). "\ n"; echo deldot ("hello world...."). "\ n"; echo deldot ("hello.world."). "\ n"

Output as

Hello world

Hello world

Hello world

Hello.world

2. In_array

In_array (mixed $needle, array $haystack, bool $strict = false): bool

The first parameter, $needle, is the value to be searched, $haystack is the array to be searched, and the third parameter determines whether to make a type comparison.

The third type defaults to false, that is, regardless of whether the type is the same.

For the following inputs:

If (in_array ("AAA", $arr,false)) echo 1x if (in_array ("aaa", $arr,false)) echo 2 x if (in_array ("AAA", $arr,true)) echo 3 x if (in_array ("aaa", $arr,true)) echo 4

Output

thirteen

3. Intval

Intval (mixed $value, int $base = 10): int

The intval function is used to get the integer value of a variable.

The first parameter, $value, is the variable to get the integer value, which can be a string, numeric value, and array.

The second parameter, $base, specifies the base used by the conversion, which is valid if and only if the variable to be converted is a string.

When the second parameter is 0, the format of the variable is detected to determine the conversion base to be used.

Use hexadecimal when there is a leading 0x or 0X.

Use octal when there is a leading 0.

Otherwise use the decimal system.

The value returned by the intval function is a value of type int. Returns 0 when the conversion is unsuccessful.

In particular, note that the value returned by using this function has an upper limit. When the converted value is larger than the integer range of php, the returned result is the upper limit of the integer value.

Echo intval; echo "\ n"; echo intval ("111a"); echo "\ n"; echo intval ("0x333"); echo "\ n"; echo intval ("888", 8); echo "\ n"; echo intval ("122", 3); echo "\ n"; echo intval ("111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111

Output as

one hundred and eleven

one hundred and eleven

0

0

seventeen

9223372036854775807

9223372036854775807

4. Strrchr

Strrchr (string $haystack, mixed $needle): string

The strrchr function looks for $needle in the string $haystack and returns the last found $needle and the string that follows it. If no $needle is found in the string, false is returned.

Note:

If the second parameter is not a single character, only the first character of the string is used to find and match.

If the second parameter is a numeric value, the numeric value is converted to the corresponding ASCII code for matching.

S = "hh2333"; echo strrchr ($SMagneh'). "\ n"; echo strrchr ($SMagneh wweraer'). "\ n"; echo strrchr ($SMagne104). "\ n"; if (strrchr ($Skinghouse k') = = false) echo "false"

Ha2333

Ha2333

Ha2333

False

5. Strtolower

Strtolower (string $string): string

Converts each English character in the string $string to lowercase and returns.

S = "HaHaHaHaHaMagma Hellohammer!"; echo strtolower ($S)

,hello!!

6. Strrposstrrpos (string $haystack, string $needle, int $offset = 0): int

Returns the last occurrence of the character $needle.

In php4, $needle can only be a single character. If there are multiple characters in $needle, only the first character is used for matching.

Similar to strrchr, if $needle is a numeric value, the ASCII character corresponding to that numeric value is used for matching.

Starting with php5, $needle can be multiple characters.

Starting with php5, strrpos adds a new parameter, $offset, which specifies where to start the match from $haystack.

Returns the matching subscript position, and returns false when there is no match.

Note:

Because the return value may be zero, the all-equal symbol = = must be used when determining whether the return value is false.

This function is case sensitive. Functions similar to this function are:

Stripos: find the first place to appear, case-insensitive.

Strpos: find the first place to appear, case-sensitive.

Strripos: looks for the last occurrence, case-insensitive.

That is, the appearance of "I" is case-insensitive, and the appearance of "rr" is to find the last one.

$s = "Phpphphpphpp"; echo strrpos ($s, "php"); echo strrpos ($s, "h"); echo strrpos ($s, "P"); if (strrpos ($s, "PHP") = false) echo "No exist"

Output:

890No exist

Note: the PHP version used in the test is 5.3.3.

The results may be different in PHP4.

7. Str_ireplacestr_ireplace (mixed $search, mixed $replace, mixed $subject, int & $count =?): mixed

The str_ireplace function is used to replace elements in an array or substrings in a string.

The first parameter, $search, is the content to be replaced (substring or array), the second parameter, $replace, is the content to be replaced (string or array), and the third parameter, $subject, is the replaced string.

If both $search and $replace are strings, the matching substring $search in $subject will be replaced with $replace.

If both $search and $replace are arrays, a mapping replacement will occur. If the number of values of $replace is less than the number of search, the extra replacement will be done with an empty string.

If $search is an array and $replace is a string, $replace is used for every element of search that appears in $subject.

$count can be used to limit the number of replacements.

Note:

The replacement occurs from left to right.

This function substitution is case-insensitive. (another function, str_replace, is case-sensitive)

Hello.

Hello.

Hello.Hpp

Hello.php

three

Hello...

Hello.1.2

Hello.1... two

Hello.1.1.1

Hello.2 hello.3 hello.2

8. Strstr

Strstr (string $haystack, mixed $needle, bool $before_needle = false): string

Find the first occurrence of the string $needle in $haystack and return the string $needle and the string that follows it.

A third parameter, $before_needle, is added from PHP5. If the value of $before_needle is true, the part before $needle is returned.

$s = "123phpphp.php"; echo strstr ($s, "php"). "\ n"; echo strstr ($s, "php", true). "\ n"

Phpphp.php

one hundred and twenty three

9. Substr

Substr (string $string, int $offset,? int $length = null): string

Returns the substring in the string $string.

Offset specifies the subscript position of the first character of the substring in $string, and $length specifies the length of the substring to be intercepted.

The value of $length:

When $length is the default, the function intercepts and returns the string from $offset to $length.

When $length takes a positive number, a maximum of $length characters will be intercepted and returned starting with $offset.

When $contains takes 0, an empty string is returned.

When $length is negative, the character from $offset to the penultimate $length of the string $string is returned.

$s = "123456789"; echo substr ($smen1, echo substr 3). "\ n"; echo substr ($sgrain1, procrastination 1). "\ n"; echo substr ($smen1). "\ n"; echo substr ($smen1). "\ n".

two hundred and thirty four

2345678

23456789

10. Trim

Trim (string $str, string $character_mask = "\ t\ n\ r\ 0\ x0B"): string

Remove the white space characters from the beginning and end of the string $str.

When the second parameter is kept by default, the characters removed are:

"" Spac

"\ t" tab character

"\ n" newline character

"\ r" carriage return

"\ 0" empty byte character

"\ x0B" vertical tab

S = "\ n123456789\ t\ n123456789\ r"; echo trim ($s)

1 23456789

123456789

Attach PHP file upload processing

$_ FILES ["file"] ["name"] the original name of the client submission file

$_ FILES ["file"] ["type"] the MIME type of the file provided by the browser, for example, the gif image is image/gif. However, this type is not checked on the PHP side, so don't take it for granted.

$_ FILES ["file"] ["size"] the size of the uploaded file in bytes

$_ FILES ["file"] ["tmp_name"] the temporary file name stored on the server after the file is uploaded

$_ FILES ["file"] ["error"] the error code related to the file upload. A value of 0 means the upload is successful.

After reading this, the article "what are the common functions for uploading PHP files" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself to understand it. If you want to know more about related articles, you are welcome to follow the industry information channel.

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