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Installing and configuring PHP String Functions

Requirements

PHP String functions do not require any external library files.

Installation

Since PHP String functions are part of the PHP core, they don't require any installation.

Runtime Configuration

You don't need to add any directive in php.ini for running PHP String functions.

Resource Types

PHP String functions have no defined resource types defined.

Predefined constants

In the following table, we have given a list of constants which are part of the PHP core.

String constants
Constant's Name Type
CRYPT_SALT_LENGTH Integer
CRYPT_STD_DES Integer
CRYPT_EXT_DES Integer
CRYPT_MD5 Integer
CRYPT_BLOWFISH Integer
HTML_SPECIALCHARS Integer
HTML_ENTITIES Integer
ENT_COMPAT Integer
ENT_QUOTES Integer
ENT_NOQUOTES Integer
CHAR_MAX Integer
LC_CTYPE Integer
LC_NUMERIC Integer
LC_TIME Integer
LC_COLLATE Integer
LC_MONETARY Integer
LC_ALL Integer
LC_MESSAGES Integer
STR_PAD_LEFT Integer
STR_PAD_RIGHT Integer
STR_PAD_BOTH Integer

See also

PHP Function Reference

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PHP: Tips of the Day

PHP: Pass a PHP string to a JavaScript variable (and escape newlines)

<script>
  var myvar = <?php echo json_encode($myVarValue); ?>;
</script>

Using json_encode() requires:

  • PHP 5.2.0 or greater
  • $myVarValue encoded as UTF-8 (or US-ASCII, of course)

Since UTF-8 supports full Unicode, it should be safe to convert on the fly.

Note that because json_encode escapes forward slashes, even a string that contains </script> will be escaped safely for printing with a script block.

Ref : https://bit.ly/34f0Dym