Question

How to use the function stristr() to find case-insensitive substring (word) in string in PHP

Answer 1

 $s = 'PHP';
 echo stristr($s, 'h'); 


/*
run:
    
HP 
    
*/

 

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Answer 2

// string stristr( string $haystack , mixed $needle [, bool $before_needle = false ])

$s = 'PHP';
echo stristr($s, 'h', true);


/*
run:
    
P 
    
*/

 

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Answer 3

// string stristr( string $haystack , mixed $needle [, bool $before_needle = false ])

$s = 'PHP';
echo stristr($s, 104); // h ascii = 104


/*
run:
    
HP 
    
*/

 

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Answer 4

// string stristr( string $haystack , mixed $needle [, bool $before_needle = false ])

$sentence = "Linux c programming";
$word = "Linux";
     
if (stristr($sentence, $word) !== false)
    echo "Found<br />";
else
    echo "NOT Found<br />";
     
if (stristr($sentence, "LINUX") !== false)
    echo "Found<br />";
else
    echo "NOT Found<br />";


/*
run:
    
Found
Found 
    
*/

 

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