DJ Mike's Tutorials: PHP

String Functions

addcslashes()

Quote string with slashes in a C style

addslashes()

Quote string with slashes

bin2hex

Convert binary data into hexadecimal representation.

chop

Alias of: rtrim().

chr

Return a specific character

chunk_split()

Split a string into smaller chunks

convert_cyr_string()

Convert from one Cyrillic character set to another

convert_uudecode()

Decode a uuencoded string

convert_uuencode()

Uuencode a string

count_chars()

Return information about characters used in a string

crc32()

Calculates the crc32 polynomial of a string.

crypt()

One-way string encryption (hashing)

echo

Output one or more strings

ereg()

Searches a string for matches to the regular expression. Case-sensitive.
Format: ereg("regex", $string);

eregi()

Searches a string for matches to the regular expression. Case-insensitive.
Format: eregi("regex", $string);

explode()

Split a string by string

fprintf()

Write a formatted string to a stream

get_html_translation_table

Returns the translation table that is used internally for htmlspecialchars() and htmlentities().

htmlentities()

Convert all applicable characters to HTML entities

hebrev()

Convert logical Hebrew text to visual text

hebrevc()

Convert logical Hebrew text to visual text with newline conversion

highlight_string()

Colors HTML & PHP code by syntax. Show Example | Show Code | Hide

html_entity_decode()

Convert all HTML entities to their applicable characters.

htmlspecialchars_decode()

Convert special HTML entities back to characters

htmlspecialchars()

Convert special characters to HTML entities

implode()

Join array elements with a string

join()

Alias of implode

lcfirst()

Make a string's first character lowercase

lcfirst()

levenshtein

Calculate Levenshtein distance between two strings

levenshtein()

localeconv

Get numeric formatting information

ltrim

Strip whitespace (or other characters) from the beginning of a string

md5_file()

Calculates the md5 hash of a given file

md5()

Calculate the md5 hash of a string

metaphone()

Calculate the metaphone key of a string

money_format()

Formats a number as a currency string

nl_langinfo()

Query language and locale information

nl2br()

Replaces new lines with the HTML tag, <br />
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number_format

Format a number with grouped thousands

ord

Return ASCII value of character

ord()

parse_str()

Parses the string into variables

parse_url()

Accepts a string representing a URL and returns the components as an associative array. This includes the

• scheme (http, https, ftp ect.)
• host
• port
• user
• pass
• path
• query (after the question mark ?)
• fragment (after the hashmark #)

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print

Output a string

printf()

Output a formatted string

quoted_printable_decode

Convert a quoted-printable string to an 8 bit string

quoted_printable_decode()

quotemeta()

Quote meta characters

rtrim()

Strip whitespace (or other characters) from the end of a string

setlocale()

Set locale information

sha1_file

Calculate the sha1 hash of a file

sha1

Calculate the sha1 hash of a string

similar_text

Calculate the similarity between two strings

soundex

Calculate the soundex key of a string

sprintf

Return a formatted string

sscanf

Parses input from a string according to a format

str_getcsv()

Parse a CSV string into an array

str_ireplace()

Case-insensitive version of str_replace.

str_pad()

Pad a string to a certain length with another string

str_repeat()

Repeats a string a specified number of times
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str_replace()

Replaces all occurances of a string within a larger string with another string. Case sensitive.
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str_rot13

Perform the rot13 transform on a string

str_shuffle

Randomly shuffles a string

str_split

Convert a string to an array

str_split()

str_word_count

Return information about words used in a string

str_word_count()

strcasecmp

Binary safe case-insensitive string comparison

strchr()

Alias of strstr

strcmp

Binary safe string comparison

strcoll

Locale based string comparison

strcspn

Find length of initial segment not matching mask

strip_tags()

Removes HTML and PHP tags from a string. Has an optional field where allowed tags that should not be stripped,
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stripcslashes()

Un-quote string quoted with addcslashes

stripos

Find position of first occurrence of a case-insensitive string

stripslashes()

When HTML is entered into a form, quotes are automaticly escaped with backslashes. To un-do that, use stripslashes() before the string is outputed.

strnatcasecmp()

Case insensitive string comparisons using a "natural order" algorithm

strnatcmp

String comparisons using a "natural order" algorithm

strncasecmp

Binary safe case-insensitive string comparison of the first n characters

strncmp

Binary safe string comparison of the first n characters

strpbrk

Search a string for any of a set of characters

strlen()

Show the number of characters in a string
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strstr()

Find first occurrence of a string

strpos()

Find position of first occurrence of a string

strrchr()

Find the last occurrence of a character in a string

strrev

Reverse a string

strripos()

Find position of last occurrence of a case-insensitive string in a string

strrpos

Find position of last occurrence of a char in a string

strspn

Find length of initial segment matching mask

strtok()

Tokenize string

strtolower()

Converts all upper case characters to lower case
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strtoupper

Converts all lower case characters to upper case
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strtr()

Translate certain characters

substr_compare()

Binary safe comparison of 2 strings from an offset, up to length characters

substr_count()

Count the number of substring occurrences

substr_replace

Replace text within a portion of a string

substr()

Finds a substring in $string starting from start and reading number characters
Format: $substring = substr($string, start, number);

trim

Strip whitespace (or other characters) from the beginning and end of a string

ucfirst

Make a string's first character uppercase

ucwords()

Capitalizes the first letter of every word
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trim()

Strips whitespace (or other characters) from the beginning and end of a string. Whitespace include

• &0; "\0", the NUL-byte.
• &32; " ", an ordinary space.
• &9; "\t", a tab.
• &10; "\n", a new line.
• &11; "\x0B", a vertical tab.
• &13; "\r", a carriage return.

Format: $out = trim($in);
Has an optional parameter that specifies other characters to remove.
Format: $out = trim($in, "ab");
In the example above, the letters a and b will be removed along with white spaces if they are leading or trailing characters. With .., you can specify a range of characters to be removed.
Format: $out = trim($in, "a..n");
In the example above, the letters a through n will be removed along with white spaces if they are leading or trailing characters.

vfprintf()

Write a formatted string to a stream

vprintf()

Output a formatted string

vsprintf()

Return a formatted string

wordwrap()

Wraps a string to a given number of characters

Created by DJ Mike from Santa Barbara