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Php substring first word how to#

In the second part, we are replacing the “Replace” of the input string with the ‘test’. In the first part of operation, we are replacing the string completely with the given string as we are specifying both starts as 0. Hence from the word “dress”, the first 2 letters will be replaced by “gu” hence becoming “guess”.Įxplanation: In this example, we are first declaring an input string $str upon which all the operations of the function are going to be performed. Example #5Įxplanation: In this example, we will specify the length parameter as 2 hence the substr_replace will start replacing the input string starting from the $start parameter which is 0 until 2. The second parameter “to” will be inserted at the position specified I.e, starting at 8th position.

Hence in this example, only the insertion takes place and there will be no replacement of strings as shown in the output.

Php substring first word how to#

Example #4Įxplanation: In this example, we are showing how to use the substr_replace to perform an insert since the replace parameter is set to 0. With the substr_replace function, we are replacing the word “Try” with the word “Done” in the starting first 3 positions. Example #3Įxplanation: In this example, we are replacing multiple strings declared inside the array at once. Hence this starts replacing the second parameter in place of first string from 3rd position starting the count from backward. This minus sign represents that the function should start replacing the word starting from the back. Example #2Įxplanation: In this example, we are showing the functionality of the -3 in the position parameter. Hence in the output exactly after 8th position the word “for” is replaced by “substring” word. Examples to Implement PHP substr_replace()īelow are the examples mentioned: Example #1Įxplanation: In this basic example, we can see that by using substr_replace function we are replacing the first string “Example for ” by the “substring” at the exact position given by the 3rd parameter i.e at the 8th position. If the case is of an array of strings, then the entire array is returned. Return Values: The value returned is the string that is generated after being replaced as per the above parameters.

Instead of insertion, a replacement is done If this $len value is 0.

This gives us the total number of characters where the replacement needs to be stopped from the end of the string when the $len is negative.

This parameter describes the length of the piece of $str which needs to be replaced if the $len is positive.

If this $len parameter is not given then the replacement will automatically stop at the end of $str. $len: This one is an optional parameter which gives us the number of characters which should be replaced.

If this $st parameter is 0 then the replacement takes place from the first character of the specified string.Ĥ.

The replacement starts from the given position from the end of the input string if the $st parameter is a negative number.

The replacement starts from the given position from the starting of the input string if the $st parameter is a positive number.

$st: This is also a mandatory parameter and indicates the index position from where the replacement needs to be started from. $replace: This is another mandatory parameter and this is the input string that replaces the $str parameter.ģ. $str: This is a mandatory parameter and this is the input string where the replacement has to be made.Ģ.