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PHP

How to creating and accessing string function in PHP?

June 25, 2020 comments off

What is String in PHP?

A string is a sequence of letters, numbers, special characters and arithmetic values or combination of all. The simplest way to create a string is to enclose the string literal (i.e. string characters) in single quotation marks (‘), like this:

Example: $my_string = ‘Hello World’;

You can also use double quotation marks (“). However, single and double quotation marks work in different ways. Strings enclosed in single-quotes are treated almost literally, whereas the strings delimited by the double quotes replaces variables with the string representations of their values as well as specially interpreting certain escape sequences.

The escape-sequence replacements are:

  • \n is replaced by the newline character
  • \r is replaced by the carriage-return character
  • \t is replaced by the tab character
  • \$ is replaced by the dollar sign itself ($)
  • \" is replaced by a single double-quote (")
  • \\ is replaced by a single backslash (\)

Here’s an example to clarify the differences between single and double quoted strings:

Example:

Manipulating PHP Strings

PHP provides many built-in functions for manipulating strings like calculating the length of a string, find substrings or characters, replacing part of a string with different characters, take a string apart, and many others. Here are the examples of some of these functions.

Calculating the Length of a String

The strlen() function is used to calculate the number of characters inside a string. It also includes the blank spaces inside the string.

Example:

outputs 24

Counting Number of Words in a String

The str_word_count() function counts the number of words in a string.

Example:

outputs 9

Replacing Text within Strings

The str_replace() replaces all occurrences of the search text within the target string.

Example:

outputs :- If the truth do not fit the theory, change the truth.

Reversing a String

The strrev() function reverses a string.

Example:

outputs:- .gnihtyreve ton tub ,gnihtyna od nac uoY

Strpos() – Search For a Text Within a String

The PHP strpos() the function searches for a specific text within a string. If a match is found, the function returns the character position of the first match. If no match is found, it will return FALSE.

Example:

outputs:- 6

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