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The FILTER_VALIDATE_BOOLEAN constant validates value as a boolean option.ReturnThe FILTER_VALIDATE_BOOLEAN constant returns TRUE for "1", "true", "on" and "yes". It returns FALSE for "0", "false", "off" and "no" otherwise, NULL.Example Live DemoOutputThe following is the output.bool(true)ExampleLet us see another example.OutputHere is the output.bool(false)
The filter_var() function is used to filter a variable with a specified filter.Syntaxfilter_var(variable, filter, options)Parametersvariable − The name of variable.filter − The name of filter to get ID.options − Specifies options to use.ReturnThe filter_var() function returns filtered data on success, or false on failure.Example Live Demo
The filter_list() function is used to list all supported filters.Syntaxfilter_list()ReturnThe filter_list() function returns an array of filters available. It returns an empty array if there are no filters.Example Live DemoOutputThe following is the output.int257 boolean258 float259 validate_regexp272 validate_domain277 validate_url273 validate_email274 validate_ip275 validate_mac276 string513 stripped513 encoded514 special_chars515 full_special_chars522 unsafe_raw516 email517 url518 number_int519 number_float520 magic_quotes521 callback1024
The tanh() function returns the hyperbolic tangent of the specified value.Syntaxtanh(val)Parametersval − A value in radiansReturnThe tanh() function returns the hyperbolic tangent of the specified value val.ExampleThe following is an example to get the hyperbolic tangent of 0 and 1: Live DemoOutput00.76159415595576ExampleLet us see an example to get the hyperbolic tangent of constant M_PI_4 − Live DemoOutput0.65579420263267ExampleLet us see an example to get the hyperbolic tangent of values 0.50 and -0.50 − Live DemoOutput0.46211715726001-0.46211715726001ExampleLet us see another example to get the hyperbolic tangent of negative values − Live DemoOutput-0.9999092042626-0.99999999587769
The tan() function returns the tangent of the specified value.Syntaxtan(val)Parametersval − A value in radiansReturnThe tan() function returns the tangent of the specified value val.Example Live DemoOutput01.5574077246549ExampleLet us see another example − Live DemoOutput1ExampleLet us see another example − Live DemoOutput0.54630248984379-0.54630248984379ExampleLet us see another example − Live DemoOutput3.3805150062466-0.64836082745909
The mt_srand() function seeds the random number generator.Note − Random number generator is seeded automatically after the release of PHP 4.2.0. This function is not needed now.Syntaxsrand(seed)Parametersseed − The seed valueReturnThe srand() function Returns nothing.Example Live DemoOutput664617053ExampleLet us see another example − Live DemoOutput4
The sqrt() function Returns the square root of a number.Syntaxsqrt(num)Parametersnum − The number for which you want to find the square rootReturnThe sqrt() function Returns the square root of the specified number.Example Live DemoOutput4ExampleLet us see another example − Live DemoOutput0.5ExampleLet us see another example − Live DemoOutputNAN
The sinh() function Returns the hyperbolic sine of a number equivalent to.(exp(num) - exp(-num))/2)Syntaxsinh(num)Parametersnum − The number for which you want to Return the hyperbolic sine. A value in radians.ReturnThe sinh() function Returns the hyperbolic sine of a number.Example Live DemoOutput01.1752011936438ExampleLet us see another example − Live DemoOutput11.5487393572582.3012989023073
The zip_read() function reads the next entry in a ZIP file archive.Syntaxzip_read(zip)Parameterszip − The zip resource to readReturnThe zip_read() function returns a resource containing a file within the zip archive on success.ExampleThe following is an example, wherein we have a zip file "new.zip", with the following files.amit.txt peter.txt result.html demo.java settings.iniExampleLet us now see the example:OutputFile Name = amit.txt File Name = peter.txt File Name = result.html File Name = demo.java File Name = settings.ini
For text transformation in CSS, use the text-transform property with the following values −text-transform: none|capitalize|uppercase|lowercase|initial|inherit;Example Live Demo div { line-height: 1.9; text-transform: uppercase; } Demo Heading This is demo text. This is another demo text. OutputExampleLet us see another example − Live Demo div { text-transform: lowercase; } Demo Heading THIS is demo text. This is ANOTHER demo text. Output