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PHP5 Basic concepts of objects and classes Inherited from the most basic concepts, mainly for experienced object-oriented programmers and readers who have not yet touched the object.As a PHP programmer, you certainly know the variables and

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PHP built-in function example tutorial, built-in function instance tutorial Uppercase and lowercase conversion related functionsStrtolower ()Strtoupper ()Ucfirst ()Ucword () Text HTML tag handler function NL2BR ()Htmllentities ()Htmlspecialchars

Uppercase and lowercase conversion related functions Strtolower () Strtoupper () Ucfirst () Ucword () Text HTML tag handler function NL2BR ()Htmllentities ()Htmlspecialchars ()Stripslashes ()Strip_tags ()Number_format ()Strrev ()MD5 ()

Php built-in function examples Strtolower () Strtoupper () Ucfirst () Ucword () Text html tag processing function Nl2br ()Htmllentities ()Htmlspecialchars ()Stripslashes ()Strip_tags ()Number_format ()Strrev ()Md5 () // Convert to lowercase$

Case-sensitive conversion functions Strtolower ()Strtoupper ()Ucfirst ()Ucword () Text HTML Tag processing function Nl2br ()Htmllentities ()Htmlspecialchars ()Stripslashes ()Strip_tags ()Number_format ()Strrev ()MD5 () // Convert to lowercase$ A =