PHP String Function

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PHP String Function
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• PHP string function helps us to manipulate string
  in various ways.
• There are various types of string function
  available.
• Here we discuss some important functions and its
  use with examples.
• echo
• strtolower ( )
• strtoupper ( )
• lcfirst()
• ucfirst()
• ucwords()
• substr_replace ( )

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1. echo It is used to print one or more string
.Echo function is faster than print print
function.   Example lt!doctype lt!DOCTYPE
htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
"String Function" ?gt lt/bodygt lt/htmlgt  Output
String Function //echo is not actually function
so we are not required to use parentheses with
it.
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2. strtolower It converts a string to lower case
letter. Example lt!doctype lt!DOCTYPE
htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
strtolower("STRING Function") ?gt lt/bodygt lt/html
gt   Output string function
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3. strtoupper ( ) It converts a string to upper
case letter. Example lt!doctype lt!DOCTYPE
htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
strtoupper("String Function") ?gt lt/bodygt lt/html
gt   Output STRING FUNCTION
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4. lcfirst( ) It converts the first character of
a string to lower. Example lt!doctype lt!DOCTYPE
htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
lcfirst("String Function") ?gt lt/bodygt lt/htmlgt  
  Output string Function
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5. ucfirst( ) It converts the first character of
a string to upper case. Example lt!doctype
lt!DOCTYPE htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
ucfirst("string function") ?gt lt/bodygt lt/htmlgt  
Output String function
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6. ucwords( ) It converts the first character of
every word to upper case. Example lt!doctype
lt!DOCTYPE htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
ucwords("string function") ?gt lt/bodygt lt/htmlgt  
Output String Function
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7. substr_replace( ) It replaces a part of a
string with another string. The syntax
is Substr_replace (string, replacement, start ,
length) There are various way to replace
string. Here the examples are Example lt!doctype
lt!DOCTYPE htmlgt lthtmlgt ltheadgt lttitlegtstring
functionlt/titlegt lt/headgt ltbodygt lt?php echo
substr_replace("hello world","nandon",6)
?gt lt/bodygt lt/htmlgt  
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Output hello nandon //here it replace world to
nandon . Number 6 means the replacement starts
from 6 position of the string. Example
2 lt!doctype lt!DOCTYPE htmlgt lthtmlgt ltheadgt lttitle
gtstring functionlt/titlegt lt/headgt ltbodygt lt?php ec
ho substr_replace("hello world",
"nandon",-5) ?gt lt/bodygt lt/htmlgt Output
hello nandon //here in this example we use (-)
negative sign so it will count the word from the
right hand side and replace.
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