PHP strchr() Function (original) (raw)
Last Updated : 21 Jun, 2023
The strchr() function is a built-in function in PHP and is used to search for the first occurrence of a given string(say searchStr) in another string(say originalStr) and returns the rest of the string from originalStr starting from the first occurrence of searchStr in orignalStr.
Note: The strchr() function is case sensitive.
Syntax:
strchr($originalStr, searchStr,searchStr, searchStr,before_search
Parameter:
- $originalStr: This parameter specifies the string in which the word is to be searched. It is mandatory
- $searchStr: It specifies the word to be searched in the given originalStr,itcanbeacharacteroranumberalso,ifanumberispassed,itsearchesfortheequivalentASCIIvaluecharacterintheoriginalStr, it can be a character or a number also, if a number is passed, it searches for the equivalent ASCII value character in the originalStr,itcanbeacharacteroranumberalso,ifanumberispassed,itsearchesfortheequivalentASCIIvaluecharacterintheoriginalStr. It is mandatory.
- $before_search: This is an optional parameter which when set to True returns the part of originalStrbeforethefirstoccurrenceoforiginalStr before the first occurrence of originalStrbeforethefirstoccurrenceofsearchStr. It is set to false by default.
Return Value: It returns a string depending on the below three cases:
- It returns the string starting from the first occurrence of the searchStrinsearchStr in searchStrinoriginalStr to the end of the originalStrwhentheoriginalStr when the originalStrwhenthesearchStr is found.
- It returns nothing when the searchStrisnotpresentinthegivensearchStr is not present in the given searchStrisnotpresentinthegivenoriginalStr.
- It returns the part of string before the first occurrence of the searchStrwhen∗∗searchStr when searchStrwhen∗∗before_search is set to TRUE.
Examples:
Input : $originalStr = "geeks for geeks" $searchStr = "geeks" Output : geeks for geeks
Input : $originalStr = "geeks for geeks" $searchStr = "for" Output : for geeks
Input : $originalStr = "striver has published 180 articles" searchStr="has"searchStr = "has" searchStr="has"before_search = TRUE Output : striver
Input: originalStr="geeksforgeeks"originalStr = "geeks for geeks" originalStr="geeksforgeeks"searchStr = "gfg" Output: No output
Below programs illustrate the strchr() function in PHP:
Program 1: Program to demonstrate strchr() function when word is found.
PHP
<?php
$originalStr = "geeks for geeks" ;
$searchStr = "geeks" ;
echo strchr ( $originalStr , $searchStr );
?>
Output:
geeks for geeks
Program 2: Program to demonstrate strchr() function when word is not found.
PHP
<?php
$originalStr = "geeks for geeks" ;
$searchStr = "gfg" ;
echo strchr ( $originalStr , $searchStr );
?>
Output:
No Output
Program 3: Program to demonstrate strchr() function when word is found and $before_search is set to true.
PHP
<?php
$originalStr = "geeks for geeks" ;
$searchStr = "for" ;
echo strchr ( $originalStr , $searchStr , true);
?>
Output:
geeks
Program 4: Program to demonstrate strchr() function when a part of word is passed and found.
PHP
<?php
$originalStr = "geeks for geeks" ;
$searchStr = "eks" ;
echo strchr ( $originalStr , $searchStr );
?>
Output:
eks for geeks
Program 5: Program to demonstrate strchr() function when a number is passed and its equivalent ASCII character is searched.
PHP
<?php
$originalStr = "geeks for geeks" ;
$searchStr = 101 ;
echo strchr ( $originalStr , $searchStr );
?>
Output:
eeks for geeks